Web Resources
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Book References
Image/text of letter in Hynek, J Allen in his “The UFO Experience” (1972) (available on Amazon USA and on Amazon UK) (in Chapter 11) at page 167 of the Henry Regnery hardback edition (with same page numbering in the Abelard-Schuman hardback edition) at page 189 of the various Ballantine paperback editions, at page 209 of the Corgi paperback edition.
For discussion of Colonel Raymond S Sleeper’s letter see the following:
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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 page 477 (forming part of an entry entitled “Project Blue Book”) of the Visible Ink Press softcover edition. |
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Clark, Jerome in his “The UFO Encyclopedia: 1st edition: Volume 3 – High Strangeness” (1996) (available on Amazon USA and on Amazon UK) at page 414 (in an entry entitled “Project Blue Book, 1960-1969”) of the Omnigraphics hardback edition. |
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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 2:L-Z at page 739 (forming part of an entry entitled “Project Blue Book” at pages 730-742) of the Omnigraphics hardback edition. |
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Hynek, J Allen in his “The UFO Experience” (1972) (available on Amazon USA and on Amazon UK) (in Chapter 11) at pages 167-168 of the Henry Regnery hardback edition (with same page numbering in the Abelard-Schuman hardback edition), at pages 189-190 of the various Ballantine paperback editions, at pages 209-210 of the Corgi paperback edition. |
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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 253 (in Chapter 9) of the Indiana hardback edition, pages 225 of the Signet paperback edition. |
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See also references provided in the entry for Hynek’s response (7 October 1968)
Other Material