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Caves of Pennsylvania in the Eighteenth Century...
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Images of the Ice Age...
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Jewel Cave National Monument...
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Kartchner Caverns...
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Cave of the Winds Then & Now...
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50 Years of Texas Caving...
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A Man Deep In Mendip...
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American Caving Accidents 50th Anniversary...
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Arming the Confederacy...
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Beyond Mammoth Cave...
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