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This is Government Attic's posting of a 1969 Library of Congress annotated bibliography, UFOs and Related Subjects, compiled by Lynn E. Catoe for the Air Force Office of Scientific Research. The Defense Technical Information Center released it under FOIA in November 2014. The bibliography lists more than 1,600 items and was requested to support the University of Colorado UFO study led by Edward U. Condon. Its preface concludes that no simple, single explanation of the UFO phenomenon applies to all cases.
“Harper”14 pages
Keyhoe, Donald E. I know the senet of the flying saucers. True, \.'. 47, Jan. 1966: 34-36, 94-95. Author suggests that control over gravity is the only explanation for tht> astound- iag maneuvers that "flying saucers" are said to m!-!ke. -··--- Tefatci:s hemligh~t: antigravitation. SOkaren, v. 4, no. 6. 1967: 7-10. Obsn, Neville Spearman, 1959. 205 p. Discusse:; in detailed technical terms the forces that UFOs use to navigate in earth's atmosphere and to travel through space on interplanetary voyages. Presented in questioa-a ..ld-answer form, information synthesizes series of iive alleged meetings between author and captain of an extraterrestrial spacecr::Jt. Lauritzen, Han-,, Disclosure of the motive power systems of the flying saucers. Het interplanetaire nieuwsbulletin, v. 1, Sept. 1966: 10-12. 148
Document, cited by the archive. The PDF is mirrored here; the original link is under it. 419 pages are in the text index: search them above, or from the library's search.