Walter Perren, (left) teaching at Warden Mountain Training School, Cuthead Valley, Banff National Park, in Canada, 1957. The man at right is unidentified. | Five Things to Know About Climbing at Back of the Lake

Walter Perren, (left) teaching at Warden Mountain Training School, Cuthead Valley, Banff National Park, 1957. The man at right is unidentified.

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