| Geology of the Grand Canyon
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Sources:
"Geology of the Grand Canyon," edited by William J. Breed and Evelyn Roat
"Oasis in Space," by Preston Cloud
"Pages of Stone," by Halka Chronic
"Encyclopaedia Britannica"
"The Great Geographical Atlas," published by Rand McNally
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Sources:
"Geology of the Grand Canyon," edited by William J. Breed and Evelyn Roat
"Oasis in Space," by Preston Cloud
"Pages of Stone," by Halka Chronic
"Encyclopaedia Britannica"
"The Great Geographical Atlas," published by Rand McNally
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