Brief review to be added of Ivan T Sanderson's book “Uninvited Visitors” (1969) (available on Amazon USA and on Amazon UK)

Brief review to be added of “UFOs? Yes!” (1968) (available on Amazon USA and on Amazon UK) by David R Saunders and R Roger Harkins.

Brief review to be added of Richard Sauder's book “Underground Bases and Tunnels” (1995) (available on Amazon USA and on Amazon UK)

Brief review to be added of G Cope Schellhorn's book “Extraterrestrials in Biblical Prophecy” (1989) (available on Amazon USA and on Amazon UK).