Observing UFOs : an investigative handbook /

UFOs : opposing viewpoints /
by: Arvey, Michael
Published: (1989)

UFOs /
Published: (2005)

UFOs /
Published: (2022)

Science meets the UFO enigma /
by: Bragg, Desmond
Published: (2000)

UFOs : the public deceived /
by: Klass, Philip J.
Published: (1983)

UFO headquarters : investigations on current extraterrestrial activity /
by: Wright, Susan (Laurie Susan)
Published: (1998)

UFOs explained /
by: Klass, Philip J.
Published: (1976)

Science and the UFOs /
by: Randles, Jenny
Published: (1985)

The UFO phenomenon /
Published: (1987)

UFOs--identified /
by: Klass, Philip J.
Published: (1968)

The UFO evidence.
Published: (2001)

UFOs : an insider's view of the official quest for evidence /
by: Craig, Roy, 1924-
Published: (1995)

UFOs--God's chariots? : Flying saucers in politics, science, and religion /
by: Peters, Ted, 1941-
Published: (1977)

UFOs : generals, pilots, and government officials go on the record /
by: Kean, Leslie
Published: (2010)

UFOs: interplanetary visitors : a UFO investigator reports on the facts, fables, and fantasies of the flying saucer conspiracy /
by: Fowler, Raymond E., 1933-
Published: (1979)

The UFO experience ; a scientific inquiry /
by: Hynek, J. Allen (Joseph Allen), 1910-1986
Published: (1974)

The UFO evidence : (unidentified flying objects) /
Published: (1964)

UFO's over the Americas /
by: Lorenzen, Jim
Published: (1968)

UFOs: the whole story /
by: Lorenzen, Coral E., 1925-, et al.
Published: (1969)

UFOs and the limits of science /
by: Story, Ronald
Published: (1981)

UFOs ... and their mission impossible /
by: Wilson, Clifford A.
Published: (1975)

UFO contact at Pascagoula /
by: Hickson, Charles
Published: (1983)

The official guide to UFOs.
Published: (1968)

The UFO controversy in America /
by: Jacobs, David Michael, 1942-
Published: (1975)

Casebook of a UFO investigator : a personal memoir /
by: Fowler, Raymond E., 1933-
Published: (1981)

The Encyclopedia of UFO's /
Published: (1980)

The UFO encyclopedia /
by: Sachs, Margaret
Published: (1980)

The UFO guidebook /
by: Briazack, Norman J.
Published: (1978)

UFO magazine.

UFOs in the 1980s /
by: Clark, Jerome
Published: (1990)

UFO's, past, present, and future /
by: Emenegger, Robert
Published: (1974)

Situation red, the UFO siege! /
by: Stringfield, Leonard H.
Published: (1977)

Official guide to UFO sightings /
by: Sifakis, Carl
Published: (1979)

UFO's : the hidden evidence : 1981 Mufon UFO Symposium proceedings, M.I.T., Cambridge, Mass., July 25 & 26, 1981 /
Published: (1981)

The UFO book : encyclopedia of the extraterrestrial /
by: Clark, Jerome
Published: (1998)

UFO : the definitive guide to unidentified flying objects and related phenomena /
by: Ritchie, David, 1952 September 18-
Published: (1994)