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Location

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Cave, New Discovery, survey party on Fossil Avenue Mammoth Cave National Park; National Park Service
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1939-09
Cave, survey party at work during opening of end of Fossil Avenue, 1942 Mammoth Cave National Park; National Park Service
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1942-03
Unidentified cave entrance Mammoth Cave National Park; National Park Service
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1938-06
Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service
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1940-07
Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service
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1940-07
Unidentified cave entrance Mammoth Cave National Park; National Park Service
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1938-06
Frozen Niagara Mammoth Cave National Park; National Park Service
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Circa 1934
Frozen Niagara Mammoth Cave National Park; National Park Service
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Circa 1934
Cave, Eyeless Crayfish Mammoth Cave National Park; National Park Service
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1941-08
Interior of cave Mammoth Cave National Park; National Park Service
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Circa 1935
Cave, Eyeless Crayfish Mammoth Cave National Park; National Park Service
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1941-08
Cave in Cedar Sink Mammoth Cave National Park; National Park Service
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Circa 1930
Tree in cave Mammoth Cave National Park; National Park Service
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1940-12
Cave, saltpeter works Mammoth Cave National Park; National Park Service
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1940-10
Frozen Niagara Mammoth Cave National Park; National Park Service
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Circa 1934
Cave, Frozen Niagara entrance, 1941 Mammoth Cave National Park; National Park Service
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1941-09
Cave cliff walk Mammoth Cave National Park; National Park Service
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1939-03-30
Cave, saltpeter vats Mammoth Cave National Park; National Park Service
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Circa 1935
Cave, saltpeter vats Mammoth Cave National Park; National Park Service
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Circa 1935
Tree in cave Mammoth Cave National Park; National Park Service
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1940-12
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