What are the most important climbing knots to know? - Quora
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What is the safest way to tie in when rock climbing using a figure 8 knot? - Quora
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Knots - General information for cavers, climbers, and canyoneers. — Nicholaus Vieira
Knots - General information for cavers, climbers, and canyoneers. — Nicholaus Vieira
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Knots in ropes and slings weaken the material