In or around August 1948, Project Sign staff allegedly prepared an “Estimate of the Situation” that allegedly reached the conclusion that flying saucers were real and came from outer space.
The alleged existence of this document is controversial, as are details such as its alleged date. It is sometimes stated to have been dated 5 August 1948, sometimes the 1 August 1948, usually simply August 1948, sometimes September 1948, occasionally October 1948 and even “in early 1949”.
Web Resources
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Book References
For discussion of the alleged Estimate of the Situation see the following:
Year |
Discussion by:
|
No. of Pages |
Anderson, Jack in Kevin Randle’s “Conspiracy of Silence” (1997) (available on Amazon USA and on Amazon UK) at page ix (in the Foreword) of the |
1 |
|
Baker, Alan in his “Sci-Fi Channel: True Life Encounters: UFO Sightings” (1997) (available on Amazon USA and on Amazon UK) at pages 144-145 (in Chapter 5) of the Orion softcover edition. |
2 |
|
Baker, Alan in his “The Encyclopaedia of Alien Encounters” (1999) (available on Amazon USA and on Amazon UK) at page 73 (in an entry entitled “ ‘Estimate of the Situation’ ”) of the Virgin hardback edition. |
1 |
|
Bennett, Colin in his “An American Demonology : Captain Edward J Ruppelt and the official UFO investigation of the United States Air Force” (2005) (available on Amazon USA and on Amazon UK) at pages 41-42 (in the unnumbered chapter entitled “A Chain of Being”) of the Headpress softcover edition. |
2 |
|
Blum, Howard in his “Out There“ (1990) (available on Amazon USA and on Amazon UK) at page 64 (in Chapter 6) of the Simon & Schuster hardback edition, at pages 58 of the Pocket Star paperback edition. |
1 |
|
Blum, Ralph and Blum, Judy in their “Beyond Earth: Man’s Contact with UFOs” (1974) (available on Amazon USA and on Amazon UK) at page 90 (in Chapter 8) of the Bantam paperback edition (with the same page numbering in the Corgi paperback edition). |
1 |
|
Bramley, William in his “The Gods of Eden” (1989) (available on Amazon USA and on Amazon UK) at page 421 (in Chapter 38) of the |
1 |
|
Briazack, Norman and Mennick, Simon in their “The UFO Guidebook” (1978) (available on Amazon USA and on Amazon UK) at page 83 (in the entry entitled “Estimate of the Situation”) of the Citadel softcover edition. |
1 |
|
Brookesmith, Peter in his “UFO: The Government Files” (1996) (available on Amazon USA and on Amazon UK) at pages 27-28 (in Chapter 1) of the Parragon hardback edition. |
2 |
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Butler, Brenda & Dot Street & Randles, Jenny in their “Sky Crash” (1984) (available on Amazon USA and on Amazon UK) at pages 150-151 (in Chapter 14) of the Grafton paperback edition. |
2 |
|
Canadeo, Anne in her “UFO’s: The Fact or Fiction File” (1990) (available on Amazon USA and on Amazon UK) at page 12 (in Chapter 2 of the pro-UFO side of the book, i.e. the side which starts with the Chapter 1 entitled “Visitors at Cisco Grove”) of the Walker hardback edition. |
1 |
|
Clark, Jerome in “The Total UFO Story” (1979) (edited by Milt Machlin) (available on Amazon USA and on Amazon UK) at page 13 (in Chapter 1) of the Dale paperback edition. |
1 |
|
Clark, Jerome in his “Strange Skies: Pilot Encounters with UFOs” (2003) (available on Amazon USA and on Amazon UK) at pages 78-79 (in Chapter 4) of the Citadel softcover edition. |
2 |
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Clark, Jerome in his “The UFO Book: Encyclopedia of the Extraterrestrial” (1998) (available on Amazon USA and on Amazon UK) at pages 177-179 of the Visible Ink Press softcover edition in an entry entitled “Estimate of the Situation”. Also briefly discussed at page |
3 |
|
Clark, Jerome in his “The UFO Encyclopedia: 1st edition: Volume 1 – UFOs in the 1980s” (1990) (available on Amazon USA and on Amazon UK) at page xi of the Apogee hardback edition in an entry entitled “The UFO Phenomenenon before 1980”. |
1 |
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Clark, Jerome in his “The UFO Encyclopedia: 1st edition: Volume 2 – Emergence of a Phenomenon” (1992) (available on Amazon USA and on Amazon UK) at pages 138-139 of the Omnigraphics hardback edition in an entry entitled “Estimate of the Situation”. |
2 |
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Clark, Jerome in his “The UFO Encyclopedia: The Phenomenon from the Beginning - 2nd edition” (1998) (available on Amazon USA and on Amazon UK) in Volume 1:A-K at pages 360-361 (in an entry entitled “Estimate of the Situation”) of the Omnigraphics hardback edition. |
2 |
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Clark, Jerome in his “UFO Encounters” (1992) (available on Amazon USA and on Amazon UK) at pages 26, 29, 32-33 (in the unnumbered chapter entitled “UFOs: The Official Story”) of the Publications International hardback edition. |
4 |
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Clarke, David and Roberts, Andy in their “Flying Saucerers : A social history of UFOlogy” (2007) (available on Amazon USA and on Amazon UK) at pages 12-13 (in Chapter 1) of the Alternative Albion softcover edition. |
2 |
|
Clarke, David and Roberts, Andy in their “Out Of The Shadows” (2002) (available on Amazon USA and on Amazon UK) at pages 51-52 (in Chapter 3) of the Piatkus hardback edition. |
2 |
|
Condon Report (“Scientific Study of Unidentified Flying Objects”, Edward U Condon (Director) and Daniel S Gillmor (Editor) (1969)) (available on Amazon USA and on Amazon UK) at page 849 (in Section 5, Chapter 2 “UFOs: 1947-1968”, by Edward U Condon) of the uncorrected version submitted to the Air Force (with the same page numbering in the 3 volume paperbound edition distributed by the National Technical Information Service, US Department of Commerce) at page 506 of the Vision hardback edition (with the same page numbering in the Bantam paperback edition). The first of these editions has the same page numbering as the edition available free online at the following links: http://www.project1947.com/shg/condon/contents.html |
1 |
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Corso, Philip J with Birnes, William J in their “The Day After Roswell” (1997) (available on Amazon USA and on Amazon UK) at page 286 (in Chapter 17) of the Pocket Books paperback edition. |
1 |
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Cousineau, Phil in his “UFOs: A Manual for the Millenium” (1995) (available on Amazon USA and on Amazon UK) at page 76 (in Chapter 3) of the Harper Collins paperback edition. |
1 |
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Craig, Roy in his “UFOs – An Insider’s View” (1995) (available on Amazon USA and on Amazon UK) at pages ix-x (in the Preface) of the UNT softback edition. |
2 |
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Crockett, Art in “The Total UFO Story” (1979) (edited by Milt Machlin) (available on Amazon USA and on Amazon UK) at page 148 (in Chapter 6) of the Dale paperback edition. |
1 |
|
Curran, Douglas in his “In Advance of the Landing: Folk Concepts of Outer Space” (1985) (available on Amazon USA and on Amazon UK) at page 14 (in the unnumbered chapter entitled “Deus Ex Machina”) of the updated 2001 Abbeville Press hardback edition. |
1 |
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Darling, David in his online encyclopedia, “The Encyclopedia of Astrobiology, Astronomy and Spaceflight” (2003) in the entry entitled “Sign, Project”. The relevant entry is available online at: http://www.daviddarling.info/encyclopedia/S/Sign.html |
1 |
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Dash, Mike in his “Borderlands” (1997) (available on Amazon USA and on Amazon UK) at page 149 (in Chapter 4) of the Arrow paperback edition. |
1 |
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Denzler, Brenda in her “The Lure of the Edge” (2001) (available on Amazon USA and on Amazon UK) at page 12 (in Chapter 1) of the |
1 |
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Devereux, Paul and Brookesmith, Peter in their “UFOs and Ufology – the first 50 years” (1997) (available on Amazon USA and on Amazon UK) at pages 26 (in Chapter 2), 135 (in Chapter 9) of the Blandford softcover edition. |
2 |
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di Fate, Vincent in his “The Science Fiction Art of Vincent Di Fate” (2001) (available on Amazon USA and on Amazon UK) at pages 90, 100 (in the unnumbered chapter entitled “Shadows on the Sky - The Early Flying Saucer Era”) of the Paper Tiger hardback edition. |
2 |
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Dick, Steven J in his “Life on Other Worlds“ (1998) (available on Amazon USA and on Amazon UK) at page 143 (in Chapter 5) of the |
1 |
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Dick, Steven J in his “The Biological Universe” (1996) (available on Amazon USA and on Amazon UK) at page 274 (in Chapter 6) of the |
1 |
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Dolan, Richard M in his “UFOs and the National Security State: Volume 1: 1941-1973” (2000) (available on Amazon USA and on Amazon UK) at pages 3 (in the Introduction), 101-103 (in Chapter 3) of the Keyhole softcover edition, at pages xviiii-ix, 60-61 of the 2002 revised Hampton Road softcover edition. |
4 |
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Druffel, Ann in her “Firestorm : Dr James E McDonald's Fight for UFO Science” (2003) (available on Amazon USA and on Amazon UK) at pages 78-79 (in Chapter 4), 244 (in Chapter 9) of the Wild Flower Press softcover edition. |
3 |
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Emenegger, Robert in his “UFOs Past, Present and Future” (available on Amazon USA and on Amazon UK) at page 25 (in Chapter 3) of the silver covered Ballantine paperback edition first printing, at page 25 of the blue covered Ballantine paperback edition eighth printing. |
1 |
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Fawcett, George and Greenwood, Barry in their “Clear Intent” (1984) (available on Amazon USA and on Amazon UK) at pages 220-221 (in Chapter 14) of the Spectrum softcover edition (with the same page numbering in the Fireside softcover edition published under the title “The UFO Cover-Up”). |
2 |
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Flammonde, Paris in his “Ufo Exist!” (1976) (available on Amazon USA and on Amazon UK) at pages 257-258 (in Chapter 13) of the Ballantine Books paperback edition. |
2 |
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Fowler, Raymond E in his “Casebook of a UFO Investigator” (1981) (available on Amazon USA and on Amazon UK) at page 4 (in Chapter 1) of the Prentice-Hall hardback edition. |
1 |
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Fowler, Raymond E in his “UFOs: Interplanetary Visitors” (1974) (available on Amazon USA and on Amazon UK) at pages 236 (in Chapter 13), 266-267 (in Chapter 14) of the Exposition Banner hardback edition, at pages 228, 258-259 of the Bantam paperback edition. |
3 |
|
Good, Timothy in his “Above Top Secret” (1987) (available on Amazon USA and on Amazon UK) at pages 33 (in Chapter 1), 256-257 (in Chapter 11) of the Sidgwick & Jackson hardback edition (with the same page numbering in the Guild Publishing hardback edition and the Grafton paperback edition). |
3 |
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Good, Timothy in his “Beyond Top Secret” (1996) (available on Amazon USA and on Amazon UK) at pages 9 (in Chapter 1), 319-320 (in Chapter 14) of the Sidgwick & Jackson hardback edition (with the same page numbering in the Pan paperback edition). |
3 |
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Good, Timothy in his “Need To Know : UFOs, the Military and Intelligence” (2006) (available on Amazon USA and on Amazon UK) at pages 106, 114 (in Chapter 6) of the Sidgwick & Jackson hardback edition. |
2 |
|
Greenfield, Irving A in his “The UFO Report” (1967) at pages 75-76 (in Chapter 8), 116-117 (in Chapter 13) of the Lancer paperback edition. |
4 |
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Gross, Loren E in his “The Mystery of the Ghost Rockets” (1974) at page 39 of the privately printed paperback edition. |
1 |
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Hall, Michael David and Connors, Wendy Ann in their “Captain Edward J Ruppelt : Summer of the Saucers – 1952” (2000) at pages 4, 11 (in Chapter 1) of the Rose Press softcover edition. |
2 |
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Hall, Michael David in his “UFOs : A Century of Sightings” (1999) (available on Amazon USA and on Amazon UK) at pages 83 (in Chapter 2), 95, 106-108, 116 (in Chapter 3), 255 (in Chapter 6), 343 (in the unnumbered chapter entitled “Recent Revelations”) of the Galde Press softcover edition. |
8 |
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Hall, Richard in his “Uninvited Guests” (1988) (available on Amazon USA and on Amazon UK) at page 27 (in the Introduction), 172 (in Chapter 11) of the Aurora Press paperback edition. |
2 |
|
Hansen, Terry in his “The Missing Times : News Media Complicity in the UFO Cover-Up : News Media Complicity in the UFO Cover -Up” (2000) (available on Amazon USA and on Amazon UK) at page 221 (in Chapter 6) of the Xlibris softcover edition. |
1 |
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Harbinson, W A in his “Projekt Saucer” (1995) at pages 92 (in Chapter 5), 224, 226 (in Chapter 12) of the Box Tree hardback edition. |
3 |
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Hopkins, Budd in his “Missing Time“ (1981) (available on Amazon USA and on Amazon UK) at page 5 (in the Introduction) of the Ballantine Books paperback edition. |
1 |
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Hynek, J Allen in his “The UFO Experience” (1972) (available on Amazon USA and on Amazon UK) at page 173 (in Chapter 11) of the Henry Regnery hardback edition (with same page numbering in the Abelard-Schuman hardback edition) at page 196 of the various Ballantine paperback editions, at page 216 of the Corgi paperback edition. |
1 |
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Jacobs, David Michael in his “The UFO Controversy in America” (1975) (available on Amazon USA and on Amazon UK) at page 47 (in Chapter 2) of the |
1 |
|
Kanon, Gregory M in his “The Great UFO Hoax” (1997) (available on Amazon USA and on Amazon UK) at page 23 (in Chapter 3) of the Galde Press softcover edition. |
1 |
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Keel, John A in his “The Mothman Prophecies” (1975) (available on Amazon USA and on Amazon UK) at pages 216-216 (in Chapter 16) of the 1991 I-Net softcover edition, at page 193 of the Panther paperback edition entitled “Visitors from Space”. |
2 |
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Kettelkamp, Larry in his “Investigating UFOs” (1971) (available on Amazon USA and on Amazon UK) at page 17 (in the unnumbered chapter entitled “UFO’s Under Study”) of the Target softcover edition. |
1 |
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Keyhoe, Donald E in his “Aliens from Space” (1973) (available on Amazon USA and on Amazon UK) at pages 13-14, 74 of the Signet paperback edition, at pages 27, 90 of the Panther paperback edition (in Chapters 1, 5). |
3 |
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Keyhoe, Donald E in his “Flying Saucers from Outer Space” (1953) (available on Amazon USA and on Amazon UK) at pages 166-167 (in Chapter 9) of the Henry Holt hardback edition, at pages 167-168 of the Tandem paperback edition. |
2 |
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Keyhoe, Donald E in his “Flying Saucers: Top Secret” (1960) (available on Amazon USA and on Amazon UK) at pages 40 (in Chapter 3), 96 (in Chapter 6) and 159 (in Chapter 11) of the G P Putnam hardback edition. |
3 |
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Kinder, |
2 |
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Kottmeyer, Martin S in “The Encyclopedia of Extraterrestrial Encounters” (2001) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 461 (in an entry entitled “Reconnaissance Theory of UFOs”) of the New American Library softcover edition, at page 451 of the pdf edition (with the same page numbering in the Microsoft Word edition). |
1 |
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Kottmeyer, Martin S in “The Mammoth Encyclopedia of Extraterrestrial Encounters” (2001) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 555 (in an entry entitled “Reconnaissance Theory of UFOs”) of the Robinson softcover edition. |
1 |
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1 |
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Lamb, David in his “The Search for Extraterrestrial Intelligence : A Philosophical Inquiry” (2001) (available on Amazon USA and on Amazon UK) at page 145 (in Chapter 5) of the Routledge softcover edition. |
1 |
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Lorenzen, Coral in her “Flying Saucers : the Startling Evidence of the Invasion from Outer Space” (1966) (an enlarged version of her “The Great Flying Saucer Hoax” (1962)) (available on Amazon USA and on Amazon UK) at pages 1-2 (in Chapter 1) of the Signet paperback edition. |
2 |
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Maccabee, Bruce in his “UFO-FBI Connection” (2000) (available on Amazon USA and on Amazon UK) at pages 28-29 (in Chapter 3), 36-37 (in Chapter 4), 42-46, 47–48, 51, 53 (in Chapter 5) of the Llewellyn softcover edition. |
13 |
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Maney, Charles And Hall, Richard in their “Challenge of Unidentified Flying Objects” (1961) (available on Amazon USA and on Amazon UK) at pages 19-20 (in Part 1, Chapter |
2 |
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Mannion, Michael in his “Project Mindshift” (1998) (available on Amazon USA and on Amazon UK) at pages 62 (in Chapter 3), 92 (in Chapter 4) of the Evans hardback edition. |
2 |
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Marrs, Jim in his “Alien Agenda” (1997) (available on Amazon USA and on Amazon UK) at page 106 (in Chapter 4) of the Harper Collins paperback edition. |
1 |
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Missler, Chuck and Eastman, Mark in their “Alien Encounters: The Secret behind the UFO Phenomenon” (1997) (available on Amazon USA and on Amazon UK) at page 59 (in Chapter 3) of the Koinonia House softcover edition. |
1 |
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NICAP in its “The UFO Evidence” (1964) (edited by Richard Hall) (available on Amazon USA and on Amazon UK) at pages 109-110 (in Section 9) of the privately published paperbound edition, with the same page numbering in the 1997 Barnes & Noble paperbound reprint. Available free online at: “http://www.nicap.org/ufoe/section_9.htm |
2 |
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Patton, Phil in his “Travels in Dreamland” (1997) (available on Amazon USA and on Amazon UK) at pages 164-165 (in Chapter 11) of the Orion Media hardback edition. |
2 |
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Peebles, Curtis in his “Watch the Skies!” (1994) (available on Amazon USA and on Amazon UK) at page 23 (Chapter 3, “The Classics” – in part of a section entitled “Estimate of the Situation”) of the Smithsonian hardback edition, at page 27 of the |
1 |
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Pflock, Karl T in his “Roswell: Inconvenient Facts and the Will to Believe” (2001) (available on Amazon USA and on Amazon UK) at page 189 (in Chapter 15) of the Prometheus hardback edition. |
1 |
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Picknett, Lynn in her “The Mammoth Book of UFOs” (2001) (available on Amazon USA and on Amazon UK) at page 397 (in Chapter 7) of the Robinson softcover edition. |
1 |
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Pope, Nick in his “Open Skies, Closed Minds” (1996) (available on Amazon USA and on Amazon UK) at page 166 (in Chapter 9) of the Simon and Schuster hardback edition, with the same page numbering in the Pocket Books paperback edition. |
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Randle, Kevin and Estes, Russ in their “Spaceships of the Visitors” (1997) (available on Amazon USA and on Amazon UK) at pages 57-61 (in Part 3) of the Fireside softcover edition. |
5 |
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Randle, Kevin and Schmitt, Donald in their “The Truth About the UFO Crash At Roswell” (1994) (available on Amazon USA and on Amazon UK) at page 93 (in Chapter 13) of the Evans hardback edition. |
1 |
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Randle, Kevin D and Schmitt, Donald R in their “UFO Crash at Roswell“ (1991) (available on Amazon USA and on Amazon UK) at page 239 (in Appendix A) of the Avon paperback edition. |
1 |
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Randle, Kevin in his “Case MJ-12” (2002) (available on Amazon USA and on Amazon UK) at pages 74-75, 82-89 (in Chapter 4), 95 (in Chapter 5) of the Harper Torch paperback edition. |
11 |
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Randle, Kevin in his “Conspiracy of Silence” (1997) (available on Amazon USA and on Amazon UK) at pages 63-67, 73, 74, 75 (in Chapter 3), 226-227 (in Chapter 11) of the |
10 |
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Randle, Kevin in his “Project Bluebook Exposed” (1997) (available on Amazon USA and on Amazon UK) at pages 7-10 (in the unnumbered chapter entitled “In the Beginning…”) of the Marlowe softcover edition. |
4 |
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Randle, Kevin in his “Project Moon Dust” (1998) (available on Amazon USA and on Amazon UK) at pages 10-12, 19, 24, 25 (in Chapter 1) of the |
6 |
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Randle, Kevin in his “The October Scenario” (1988) (available on Amazon USA and on Amazon UK) at page 119 (in Part 3, unnumbered section entitled “The Modern Era”) of the |
1 |
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Randle, Kevin in his “The UFO Casebook” (1989) (available on Amazon USA and on Amazon UK) at pages 28-31 (entry entitled “August 1948: The Estimate of the Situation”) of the Warner Books paperback edition. |
4 |
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Randles, Jenny and Hough, Peter in their “50 Years of UFO Encounters” (1996) (available on Amazon USA and on Amazon UK) at page 16 (in unnumbered section entitled “1948: Project Saucer”) of the Encounters Magazine softcover edition. |
1 |
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Randles, Jenny and Hough, Peter in their “The Complete Book of UFOs” (1994) (available on Amazon USA and on Amazon UK) at pages 107-108 (in Chapter 7) of the Piatkus softcover edition. |
2 |
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Randles, Jenny and Warrington, Peter in their “Science and the UFOs " (1985) (available on Amazon USA and on Amazon UK) at page 29 (in Chapter 3) of the Blackwell hardback edition. |
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Randles, Jenny in “Phenomenon“ (1988) (edited by John Spencer and Hilary Evans) (available on Amazon USA and on Amazon UK) at pages 240-241 of the MacDonald hardback edition (Part |
2 |
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Randles, Jenny in “The Age of the UFO” (1984) (edited by Peter Brookesmith) (available on Amazon USA and on Amazon UK) at page 56 (in the unnumbered chapter entitled “ ‘UFOs are bunk’ ”) of the Black Cat hardback edition. The relevant chapter is an article reprinted from the weekly partwork “The Unexplained”. |
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Randles, Jenny in “The UFO Conspiracy” (1987) (available on Amazon USA and on Amazon UK) at pages 28 (in Chapter 3), 32 (in Chapter 4), 43 (in Chapter 6) of the Barnes & Noble hardback edition. |
3 |
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Randles, Jenny in her “Alien Contact – The First Fifty Years” (1997) (available on Amazon USA and on Amazon UK) at page 15 (in the chapter entitled “1950”) of the Collins and Brown hardback edition. |
1 |
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Randles, Jenny in her “The Little Giant Encyclopedia of UFOs” (2000) (available on Amazon USA and on Amazon UK) at page 35 (in Part 1, “A UFO Timeline”) of the |
1 |
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Randles, Jenny in her “UFO Crash Landing? Friend or Foe?” (1998) (available on Amazon USA and on Amazon UK) at page 143 (in Chapter 12) of the Blandford softcover edition. |
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Randles, Jenny in her “UFOs and How to See Them” (1992) (available on Amazon USA and on Amazon UK) at page 17 (in Chapter 1) of the Brockhampton Press hardback edition. |
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Redfern, Nicholas in his “A Covert Agenda” (1997) (available on Amazon USA and on Amazon UK) at pages 14-15 (in Chapter 2) of the Simon & Schuster hardback edition. |
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Redfern, Nicholas in his “The FBI Files” (1998) (available on Amazon USA and on Amazon UK) at pages 39-40 (in Chapter 2) of the Simon & Schuster softcover edition, with the same page numbering in the Pocket Books paperback edition. |
2 |
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Ross, Daniel in his “UFOs and the Complete Evidence from Space: The Truth About Venus, Mars and the Moon” (1987) (available on Amazon USA and on Amazon UK) at page 18 (in Chapter 1) of the Pintado softcover edition. |
1 |
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Roulet, Alfred in his “The Search for Intelligent Life in Outer Space” (1973) (available on Amazon USA and on Amazon UK) at page 74 (in the unnumbered chapter entitled “A Challenge to Science”) of the |
1 |
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Ruppelt, Edward J in his “The Report on Unidentified Flying Objects” (1956) (available on Amazon USA and on Amazon UK) at pages 41, 45, 46 (in Chapter 3), 59 (in Chapter 4) of the original 17 chapter Doubleday hardback edition, at pages 62-63, 67, 69, 85 of the Gollancz hardback edition, at pages 58-59, 64, 66, 82 of the Ace paperback edition, at pages 41, 45, 46, 59 of the 1959 revised Doubleday 20 chapter hardback edition, at pages 28, 30, 32, 40-41 of the reprinted Source Books softcover edition. The first of these editions (i.e. the original 17 chapter hardback edition) has the same page numbering as the version available free online at: |
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Rux, Bruce in his “Architects of the Underworld” (1996) (available on Amazon USA and on Amazon UK) at pages 35-36 (in Chapter 2) of the Frog softcover edition. |
2 |
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Rux, Bruce in his “Hollywood Vs. the Aliens” (1997) (available on Amazon USA and on Amazon UK) at page 6 (in the Introduction) of the Frog softcover edition. |
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Sachs, Margaret in her “The UFO Encyclopedia“ (1980 (available on Amazon USA and on Amazon UK) at page 92 (in an entry entitled “Estimate of the Situation”) of the Corgi softback edition. |
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Saunders, David R and Harkins, R Roger in their “UFOs? Yes!” (1968) (available on Amazon USA and on Amazon UK) at pages 57-58 (in Chapter 5) of the Signet paperback edition. |
2 |
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Sellier, Charles E and Meier, Joe in their “UFO” (1997) (available on Amazon USA and on Amazon UK) at pages 30 (in Chapter 2), 220 (in Chapter 12) of the Contemporary Books hardback edition. |
2 |
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Shawcross, Tim in his “The Roswell File” (1997) (available on Amazon USA and on Amazon UK) at page 145 (in Chapter 9) of the |
1 |
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Smith, Marcia S in her “The UFO Enigma: Congressional Research Service, Library of Congress, UG 633, 76-52 SP” (1976) at pages 49-50 (in Chapter 5) of the Congressional Research Service stapled edition. |
2 |
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Spencer, John and Anne Spencer in their “Fifty Years of UFOs” (1997) (available on Amazon USA and on Amazon UK) at page 17 (in the unnumbered chapter entitled “1947-1957”) of the Boxtree hardback edition. |
1 |
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Spencer, John in his “The UFO Encyclopedia” (1991) (available on Amazon USA and on Amazon UK) at pages 178-179 (in an entry entitled “Knight, Colonel Gordon B”) of the Guild hardback edition (with the same page numbering in the Avon softcover edition) at page 206 of the Headline paperback edition. |
2 |
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Spencer, John Wallace in his “No Earthly Explanation” (1974) (available on Amazon USA and on Amazon UK) at page 33 (in Chapter 1) of the Corgi paperback edition. |
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Stanton, L Jerome in his “Flying Saucers : Hoax or Reality?” (1966) (available on Amazon USA and on Amazon UK) at pages 41 (in Chapter 2), 111 (in Chapter 7) of the |
2 |
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Stemman, |
2 |
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Stone, Clifford E in his “UFOs are Real“ (1997) (available on Amazon USA and on Amazon UK) at pages 7 (in Chapter 1), 45 (in Chapter 7) of the SPI softcover edition. |
2 |
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Tacker, Lawrence (Lieutenant Colonel) in his “Flying Saucers and the U.S. Air Force” (1960) (available on Amazon USA and on Amazon UK) at page 83 (in Chapter 7) of the D Van Nostrand hardback edition. |
1 |
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Thompson, Keith in his “Angels and Aliens: UFOs and the Mythic Imagination” (1991) (available on Amazon USA and on Amazon UK) at page 7 (in Chapter 1) of the Fawcett softcover edition. |
1 |
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Time-Life (Editors of) in “The UFO phenomenon: Mysteries of the Unknown” (1987) (available on Amazon USA and on Amazon UK) at page 42 (in Chapter 2) of the Time-Life Book hardback edition. |
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Trench, Brinsley Le Poer in his “The Flying Saucer Story” (1966) (available on Amazon USA and on Amazon UK) at page 17 (in Chapter 2) of the revised Tandem paperback edition. |
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Von, Johannes Buttlar in his “The UFO Phenomenon” (1980) (available on Amazon USA and on Amazon UK) at pages 29-31 (in Chapter 2) of the Book Club Associates hardback edition. |
3 |
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Weldon, John and Levitt, Zola in their “Encounters With UFOs“ (1975) (formerly “UFOs, What on Earth is Happening?”) (available on Amazon USA and on Amazon UK) at page 38 (in Chapter 2) of the Harvest House paperback edition. |
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White, Dale in his “Is Something Up There?” (1968) (available on Amazon USA and on Amazon UK) at pages 35-36 (in Chapter 3) of the Scholastic Book Services paperback edition. |
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Young, Mort in “Flying Saucers Have Arrived!” (1970) (edited by Jay David) (available on Amazon USA and on Amazon UK) at pages 207-208 (in the unnumbered chapter entitled “The Investigators”) of the World hardback edition. The relevant chapter is reprinted from “UFO : Top Secret” by Mort Young. |
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Young, Mort in his “UFO Top Secret” (1967) (available on Amazon USA and on Amazon UK) at page 21 (in Chapter 2) of the Essandess softcover edition. |
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