Scale showing height of cave ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Survey, man with level rod in cave, showing height of cave
Mammoth Cave National Park; National Park Service
Scale showing height of cave ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Scale showing height of cave ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Survey, measuring stalagmite in cave
Mammoth Cave National Park; National Park Service
Survey, man with level rod in cave
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Scale showing height of cave ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing width of cave, Cox Case
Mammoth Cave National Park; National Park Service
Survey, man with level rod in cave
Mammoth Cave National Park; National Park Service
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
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Survey, measuring broken off formations in cave
Mammoth Cave National Park; National Park Service
Survey, man with level rod in cave
Mammoth Cave National Park; National Park Service
Survey, man with level rod in cave, showing height of cave
Mammoth Cave National Park; National Park Service
Survey, man with right arm out in cave passage, showing size of cave
Mammoth Cave National Park; National Park Service
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