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William R. Halliday
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Books by William R. Halliday
American Caves and Caving: Techniques, Pleasures and Safeguards of Modern Cave Exploration
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Depths of the Earth: Caves and Cavers of the United States
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Depths of the Earth: Caves and Caverns of the United States
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Ape Cave
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Oregon Caves Discovery and Exploration
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Adventure is underground
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