The Mechanical Advantage
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Every so often the standards of climbing “jump” to a new level. Such jumps in climbing standards often follow an innovation of tools and techniques, which then become standard modes of vertical ascent.
Print Books:
Volume 1 (mostly European developments) : https://www.amazon.com/dp/B0CGZ2S58J
Volume 2 (mostly USA and global tools): https://www.amazon.com/dp/B0CH26LTFM/
John Middendorf
