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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
Ball Lightning and Fireballs Arnold, Kenneth. Are space visitors here? Fate, Summer 1948: 4-21. Reports of apparent meteor and fireball activity during 1948 are examined. Author suggests that they are not aerial phenomena but extraterrestrial spacecraft. BenedicitS, Carl. Theory of the lightning-balls and its application to tne atmosphere pnenomenon called ''flying saucers. " Arkiv fOr geofysik, v. 2, no. :i, 1954: 1-11. Author theorizes that reported UFO sightings are in reality ball lightning and gives data supporting his position. Brand, Walther. Der Kugelblitz. HamlJUrg, Henri Grand, 1923. 170 p. Theories in explanation of ball lightning are given. Characteristics that distinguish ball lightning from other meteorological phenomena (sucn as line lightning and meteors) are r.oted. Cade, C. Maxwell. Fireballs and flying se1.ucers. Flying saucer review, v. 13, Jan. -Feb. 1967: 10-12. Case histories are given of sigt:tings whkh very probably were due to ball lightning. Author warns, however, that it is more "unscientific" to try to dismiss all unexplained aerial pheno'llena than it is to hold lnc open- minded view that SC'me of them may be the artefacts of extraterrestrial communities. Constance, Arthur. The inexplicable SKy. London, W. Laurie, ld55: 308 p. 313
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.