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Glen Canyon NRAGeology of National Parks
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John Wesley Powell
• Woodcut from the frontispiece of Powell’s book, The Canyons of the Colorado
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Colorado River and Tributaries
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Aerial View of Lake Powell
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Glen Canyon Before the Dam
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Morrison Formation
• Book Cliffs region, Utah
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Stratigraphic Units (Jurassic)
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Cross-bedding in Navajo Sandstone
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Boats in a Marina
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Fecal Coliform Bacteria Counts