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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
Survey, man with level rod in cave Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with level rod in cave Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with level rod in cave Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with level rod in cave Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
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1939-03-30
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
Survey, man with wooden rule in cave measuring formation Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, man with level rod in cave, showing height of cave Mammoth Cave National Park; National Park Service
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1939-03-30
Survey, man with right arm out in cave passage, showing size of cave Mammoth Cave National Park; National Park Service
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1939-03-30
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About 39 Items

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