Mechanical Advantage: Tools for the Wild Vertical

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Zion Climbing in the 1930s
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First carabiners for climbing-summary.
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State of the Art Climbing Gear, 1964
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USA adoption of pitons 1920s-1939 Colorado (part A) Ellingwood and Lavender
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Climbing Tools and Techniques—1908 to 1939 (Europe, PartA) Myths and Legends
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Ice Tool Developments and Innovations (brief)
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Big Wall Bivouacs and "camping" part1
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A Piece of Unbent Iron--Shiprock v2
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Zion Climbing in the 1930s
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The envisioning of pitons, USA 1920s (Miriam O’Brien)
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USA adoption of pitons 1920s-1939 Colorado (part A) Ellingwood and Lavender
Mechanical Advantage Series by John Middendorf aka Bigwall Scrapbook
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Mechanical Advantage: Tools for the Wild Vertical
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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