USA adoption of pitons 1920s-1939 (part B) East Coast USA 1927-1933 (continuing mechanical advantage series by john middendorf)
sidebar to the tools and techniques stuff
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November 2022

Mechanical Advantage Series by John Middendorf aka Bigwall Scrapbook
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September 2022

Mechanical Advantage Series by John Middendorf
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Mechanical Advantage writings and ramblings by John Middendorf
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Mechanical Advantage series by John Middendorf
Mechanical Advantage sidebar
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Mechanical Advantage BigWall Climbing series by John Middendorf
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More big wall ramblings and musings, while procrastinating tools research...
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previously published big wall ramblings
The development of big wall tools and techniques by John Middendorf IV
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August 2022

Mechanical Advantage Series by John Middendorf