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UFO's--a Scientific Debate

Carl SaganThornton Page

出版	Cornell University Press, 1972
主題	Body, Mind & Spirit / UFOs & ExtraterrestrialsBody, Mind & Spirit / Unexplained Phenomena
ISBN	08014074009780801407406
URL	http://books.google.com.hk/books?id=Z5pTAAAAMAAJ&hl=&source=gbs_api