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Tony Bubb tries to figure out the crux of 'Thumb Tack (5.11+)' at the Bihedral Rock in Boulder Canyon. The steep crux is protected by a micro-cam or a small nut. Photo by Alan Doak, 2004.
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Tony B
Apr 20, 2007
Tony Bubb tries to figure out the crux of 'Thumb Tack (5.11+)' at the Bihedral Rock in Boulder Canyon. The steep crux is protected by a micro-cam or a small nut. Photo by Alan Doak, 2004.  

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Tony B
Around Boulder, CO