The Hollow Earth: The Greatest Geographical Discovery in History Made by Admiral Richard E. Byrd in the Mysterious Land Beyond the Poles--the True Origin of the Flying Saucers

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University Books, 1969 - Body, Mind & Spirit - 254 pages
This controversial book claims that flying saucers not only exist, but that they are the vehicles of a super-race that lives in a huge, underground world whose entrance is in the earth's North Pole.

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