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Glen Canyon NRA. Geology of National Parks. Locality Map. John Wesley Powell. Woodcut from the frontispiece of Powell’s book, The Canyons of the Colorado. Glen Canyon Dam. Glen Canyon NRA. Colorado River and Tributaries. Aerial View of Lake Powell. Glen Canyon Before the Dam.
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Glen Canyon NRA Geology of National Parks
John Wesley Powell • Woodcut from the frontispiece of Powell’s book, The Canyons of the Colorado
Morrison Formation • Book Cliffs region, Utah