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Cave, scientists engaged in various posed activities inside the cave, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Cave, scientists engaged in various posed activities inside the cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-07-2
Yellowstone photo album 4, page 84 Yellowstone National Park
Yellowstone photo album 6B, page 7 Yellowstone National Park
Yellowstone photo album 3, page 68 Yellowstone National Park
Yellowstone photo album 3, page 67 Yellowstone National Park
Yellowstone photo album 6B, page 5 Yellowstone National Park
Yellowstone photo album 6B, page 3 Yellowstone National Park
Yellowstone photo album 6B, page 6 Yellowstone National Park

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