[XI-7] Crompton, J. _The Spider_, London: Collins, 1950. [XI-8] CRIFO _Orbit_, November 2, 1956. [XI-9] CRIFO _Orbit_, December 7, 1956. [XI-10] Air Force Files. [XI-11] Boston _Globe_, November 24, 1960. [XI-12] Barker, G. “Chasing the Flying Saucers,” _Flying Saucers_ (September 1961), p. 33. [XI-13] Palmer, R. “NICAP: National Non-investigations Committee On Aerial Phenomena,” _Flying Saucers_ (September 1961), p. 4. [XI-14] Palmer, R. Editorial, _Flying Saucers_ (March 1962), p. 2. [XI-15] _UFO Investigator_ (July-August 1961). [XI-16] Keyhoe, D. E. _The Flying Saucer Conspiracy._ New York: Henry Holt & Co., 1955. [XI-16a] “There’s Intelligent Life on the Moon!” _Flying Saucers_ (May 1959), p. 73. [XI-17] _UFO Critical Bulletin_ (January-February 1958). [XI-18] _UFO Critical Bulletin_ (July-August 1957). [XI-19] _UFO Critical Bulletin_ (March-April 1958). [XI-20] News Release No. 98–60, Department of Defense, January 29, 1960. [XI-21] Alamogordo (N. Mex.) _Daily News_, March 13, 1960. [XI-22] Alamogordo (N. Mex.) _Daily News_, March 15, 1960. [XI-23] Tacker, L. J. _Flying Saucers and the U. S. Air Force._ Princeton, N.J.: D. Van Nostrand Co., 1960. _Chapter_ XII SPECIAL EFFECTS Some flying-saucer reports, at first glance, do not seem to belong in any of the ordinary categories of sightings such as mistaken identification of air-borne objects or astronomical phenomena. Each of these atypical UFOs forms a class of its own and, when explained, proves to be the “special effect” of a unique situation. Many are misidentified lights or reflections, but since each one derives from a peculiar combination of circumstances that may not have occurred before and is not likely to occur again, accounting for them often requires a certain amount of luck as well as patient detective work. Let us suppose, for example, that an Iowa farmer telephones the county sheriff one Tuesday afternoon to report that he has just seen a tiger running through his cornfield. When the sheriff arrives an hour later and can find no trace of a tiger, he is baffled; he knows the farmer is neither demented nor a hoaxer, and must have seen something remarkable--but what? The mystery remains unsolved until the sheriff learns from a feature story in Sunday’s paper that on the preceding Tuesday afternoon a trailer truck, carrying a shipment of animals for the Des Moines zoo, had a flat tire while traveling on Highway X near the junction with Route Y. During the stop to repair the tire, a giant eland had escaped from its cage in the trailer; it had been recaptured and the truck had then continued its journey and delivered its cargo intact.