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1327
Survey, measuring stalagmite 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
View on map 
1939-03-30
Cave, Carl Hanson measuring height of 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
Cave, Carl Hanson measuring height of ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Cave, Carl Hanson measuring height of ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Carl Hanson showing height of ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Carl Hanson showing width of cave, Cox Case 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
View on map 
1939-03-30
Survey, man in upper level of cave and another man on lower level giving perspective of cave size Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Cave, Carl Hanson measuring height of ceiling, Cox Case Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, measuring broken off formations 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
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
View on map 
1939-03-30
Survey, man with ruler measuring distance across formation Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Survey, man with light pointed at another man far above him Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Cave, Carl Hanson measuring height of ceiling, Cox Case 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 wooden rule in cave measuring formation Mammoth Cave National Park; National Park Service
View on map 
1939-03-30
Sort (date)
Items per page (20):
Page 16 of at least 68
About 1,300 Items

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