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The Colorado Plateau II:...
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The Colorado Plateau III:...
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A Natural History of the...
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Uranium Frenzy: Boom and Bust...
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Corridors of time : 1,700,000...
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Geology for the Layman and...
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Southern Colorado Plateau:...
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The Only True People: A...
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Desert Skin
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Corridors of Time
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Canyon Country Explorer #1
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Petrology of the Triassic...
Robert Allen Cadigan,
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Three essays
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Stratigraphy and origin of...
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F. G. Poole
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