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Canyoneering at Grand Canyon National Park: Monitoring pockets of wilderness in the canyon corridor (U.S. National Park Service)
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Amazon.com: Las Vegas Extreme Adventures: Hiking, Climbing, Canyoneering, Caving: 9781711925998: City Trails Publishing: Books
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Amazon.com: Las Vegas Extreme Adventures: Hiking, Climbing, Canyoneering, Caving: 9781711925998: City Trails Publishing: Books
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