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From what I can piece together, according to the The Gunks Guide by Swain the protection rating system was proposed in Rocky Heights, A Guide to Boulder Free Climbs by Erickson. According to Swain ...
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From what I can piece together, according to the The Gunks Guide by Swain the protection rating system was proposed in Rocky Heights, A Guide to Boulder Free Climbs by Erickson. According to Swain ...