Virginia Cave, 1856
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Virginia Cave, 1856 #1
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Kentucky Mammoth Cave #7
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Kentucky Mammoth Cave #3
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SEE AMERICA POSTER, c1937 #1
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Virginia Cave, 1856 #2
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Kentucky Mammoth Cave #11
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Kentucky Mammoth Cave #12
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Virginia Cave, 1857
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Rock formations in the Queen's Chamber at Carlsbad Caverns, c1935
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Rock formations in the Big Room at Carlsbad Caverns, c1935 #1
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The Crystal Grotto in the Big Room, Carlsbad Caverns, c1935
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The Temple of the Sun formation in the Big Room at Carlsbad Caverns, c1935
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Rock formations in the Big Room at Carlsbad Caverns, c1935
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