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Cave formation, Violet City Mammoth Cave National Park; National Park Service
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1939-06
Mammoth Cave, Frozen Niagara Mammoth Cave National Park; National Park Service
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View of cave formations Mammoth Cave National Park; National Park Service
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Circa 1930
Cave, New Discovery, Onyx Avenue Mammoth Cave National Park; National Park Service
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Cave formation, Violet City Mammoth Cave National Park; National Park Service
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1939-06
View of cave formations Mammoth Cave National Park; National Park Service
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Circa 1930
Cave, onyx colonnade formation Mammoth Cave National Park; National Park Service
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Circa 1942
Cave, Drapery Room formations Mammoth Cave National Park; National Park Service
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Circa 1942
View of cave formations Mammoth Cave National Park; National Park Service
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Circa 1930
Caves, Golden Fleece formations Mammoth Cave National Park; National Park Service
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Circa 1942
Cave, New Discovery, Onyx Altar Mammoth Cave National Park; National Park Service
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Cave, helictite formations, Morrison Avenue Mammoth Cave National Park; National Park Service
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Circa 1942
Man standing by cave formation Mammoth Cave National Park; National Park Service
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1940-07
Cave, New Discovery, gypsum Mammoth Cave National Park; National Park Service
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1939-09
Cave, New Discovery, Onyx Altar Mammoth Cave National Park; National Park Service
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Cave, helictite formations, Morrison Avenue Mammoth Cave National Park; National Park Service
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Circa 1942
Cave, formations in Fossil Avenue, 1942 Mammoth Cave National Park; National Park Service
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1942-03
Cave, New Discovery, gypsum Mammoth Cave National Park; National Park Service
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1939-09
Man in cave examining rock formation Mammoth Cave National Park; National Park Service
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Cave, New Discovery, needle gypsum Mammoth Cave National Park; National Park Service
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