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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.
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Strugholci, Hubertus. The possibilities of an inhabitable extraterrestrial environ- ment reachable from the earth. The journal of aviation medicine. v. 28, MARS Oct. 1957: 507-512. Ecologkal factors indispensible for the existence of terrestrial forms of life are presented. Each planet in our solar system is e.xamined in the light of these factors. and a habih\lJility index obtained. The possibility of life already existing on Mars is discussed. Abbot, C. G. The habitability of Venus, Mars, and other worlds. In Annual report of the Board of Regents of the Smithsonian Institution for the year ending June 30, 1920. Washington, D. C., U. S. Govt. Print. Off., 1922. p. 165-171. Considers the probability of the existence of intelligent life on heavenly bodies other than the ea::-th and discusses means of com- municating with the nearer planets. Aitken, R. G. Why povular inter€'st in Mars: Leailets of the Astro- nomical Society of the Pacific, v. 2, July 1925: 3-6. Antoncadi, E. M. The planet Mars. Sky, magazine of cosmic news, v. 31, July 1939: 6-7, 22. Asimov, Isaac. The wellspriugs of life. New York, Abelard-Schuman, 1960, 233 p. In so vast a universe, it is possible there are billions of "earth type" planets. Mars is the only observable planet which may providE a hd.bitat suitable for life. Bennett, Dorothy A. Men from Mars. The sky, v. 3, Dec. 1938: 8-9. Present knowiedge of conditions on Mars is reviewed to support author's certitude that a Martian invasion is out of the question. Bongers, Leonard H. Is there life on Mars? Space/aeronautics, v. 40, Aug. 1963: 86-88. 238
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.