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Preston Ercelle Cloud

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Stand Alone

Adventures in earth history
Cosmos, Earth, and man
Oasis in Space
Oasis in Space: Earth History from the Beginning
Cosmos, Earth, and man: a short history of the universe
The Ellenburger Group of Central Texas. . . Bureau of Economic Geology, John T. Lonsdale, Director. Prepared in Co-Operation with the United States Geological Survey