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Cave Detectives: Unraveling...
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Encyclopedia of Caves
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Cave Sleuths
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Exploring Caves
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Speleological and Karst...
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Layers of Stone: How Earth's...
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Beneath the Surface
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Depths of the Earth: Caves...
William R Halliday
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Caves of Knoxville and the...
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American Caves and Caving:...
William R Halliday
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American Caves and Caving:...
William R Halliday
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Cavers, Caves, and Caving
Bruce Sloane
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A Guide to Speleological...
Diana E Northup
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Cave Minerals of the World
Carol A Hill,
Paolo Forti
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Bartow County Caves: History...
Joel M Sneed
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The Science of Speleology
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Reisen Ins Unterirdische:...
Johannes Mattes
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Caves
Ronal C Kerbo
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