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WikiPedia: The_Flying_Saucers_Are_Real http://www.books.google.com/books?id=2du2fVYT8ewC http://www.books.google.com/books?id=lGyPpnFpg7UC http://www.hallrichard.com/keyhoe.htm http://www.sacred-texts.com http://www.sacred-texts.com/ufo/fsar/index.htm https://books.google.com/books?id=tkqW7YxEH1oC&pg=... https://web.archive.org/web/20090907025855/http://... https://web.archive.org/web/20140727101628/http://... https://web.archive.org/web/20140727101632/http://... https://www.gutenberg.org/author/Donald+E.+Keyhoe