Mechanical Advantage: Tools for the Wild Vertical

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The development of big wall tools and techniques by John Middendorf IV
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Mechanical Advantage: Tools for the Wild Vertical

The history of engineered tools for climbing and alpinism. (Looking for D4 portaledges? See bigwalls.net)
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BigWalls main page
Original Mechanical Advantage posted on bigwalls.net
Mechanical Advantage published in Ascent

Mechanical Advantage: Tools for the Wild Vertical

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