https://www.rei.com/product/898083/evolv-shaman-climbing-shoes

https://climbinggearreviewsuk.wordpress.com/2016/05/16/dmm-dragon-cam/

http://www.bigwalls.net/climb/camf/

https://sterlingrope.com/journal/232-fall-rating-really-mean

https://www.diverescueintl.com/product/pmi-prusik-cord-7mm/

https://www.petzl.com/US/en/Sport/News/2017-12-27/Belay-Devices-Explained

https://gripped.com/indoor-climbing/new-climbers-guide-using-climbing-chalk/

http://blog.8bplus.com/peppi-ii-talks-chalk

Bowie, William S., Thomas K. Hunt, and Hubert A. Allen Jr. "Rock-climbing injuries in Yosemite National Park." Western Journal of Medicine 149.2 (1988): 172.

Grow, Robert D. "Anchoring device for rock climbing." U.S. Patent No. 4,565,342. 21 Jan. 1986.
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