By A Mystery Man Writer
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The Underhill Sawtooth Story by Ray Brooks - IDAHO: A Climbing Guide
Mount Everest: Why don't mountain climbers use controlled sled decent to exit the death zone faster? - Quora
Mountaineering, Have Tent, Will Travel
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Glissade (climbing) - Wikipedia
Belaying and Bandaging: Mt. St Helens via Swift Glacier, May 30 - 31, 2009
American Alpine Institute - Climbing Blog: June 2017
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Ypsilon Mountain Trip Report 07/13/2015
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