From the 1971 book The Hiker's & Backpacker's Handbook by Bill Merrill (former Yosemite Nat'l Park and Olympia Nat'l Park Ranger).
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From the 1971 book The Hiker's & Backpacker's Handbook by Bill Merrill (former Yosemite Nat'l Park and Olympia Nat'l Park Ranger).