Huautla Thirty Years in One of the World's Deepest Caves By C. William Steele Cave Books, 2009 6 by 9 inches, 305 pages, hardbound ISBN 978-0-939748-70-9

The author's personal narrative of the exploration of Sistema Huautla, Oaxaca, which is the second-deepest cave in Mexico, at 1475 meters. Huautla is one of the most complex deep caves in the world, with independent deep routes from several entrances and a total length of 62 kilometers.

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