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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.
“The Pentagon”6 pages
I have sought to include items of scholarly interest and intent, and to make the bibliography as useful as possible for both scholars and general readers interested in the subject. The principal difficulties in achieving completeness are the great volume of UFO and UFO-related literature, and the fact that much of it is privately published and of limited distribution. Scientific theory of today often becomes fact tomorrow. The line between the possible and the impossible is arbitrary. Many misconceptions pass for information. One day, perhaps within our time, out of all the contradictions surrounding the UFO phenomenon, man may discover to his complete satisfaction its exact nature and origin. July 1969 LYNNE. CATOE v
Document, cited by the archive. The PDF is mirrored here; the original link is above. 419 pages are in the text index: search them above, or from the library's search.