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August 2011 edit
https://en.wikipedia.org/wiki/Snow_protection
The reference : Graydon, Don. "Snow Climbing: Roped Climbing: Snow Anchors". Get Outdoors. Retrieved 26 August 2011.
links to https://www.getoutdoors.com/go/golearn/173 but that is no longer valid. — Preceding unsigned comment added by Pcsnow (talk • contribs) 20:51, 30 May 2020 (UTC)