Depths of the Earth: Caves and Cavers of the United States

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Harper & Row, Jan 1, 1976 - Caves - 432 pages
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Field research underlies the author's accounts of the exploration of caves, the geology of famous caves such as Mammoth and Carlsbad, and the feats of spelunkers

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The Eternal Standard
In a Lonely Sandstone Cave 28
Beginnings Old and New

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About the author (1976)

William R. Halliday, M.D., has long had major interests in history and geology in addition to his work in surgery and rehabilitation medicine.

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