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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
View on map 
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
View on map 
1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Scale showing height of cave ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
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
View on map 
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
Yellowstone photo album 6B, page 23 Yellowstone National Park
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Circa 1942
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