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Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
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1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
View on map 
1938-09
Cave, showing new discovery part of cave and itsformation of gypsum, and other formation part of old Mammoth Cave, four guides leaning on large rimstone dam, 1938 Mammoth Cave National Park; National Park Service
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1938-09
Caves, New Discovery, gypsum ribbon Mammoth Cave National Park; National Park Service
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Caves, gypsum flowers on Morrison Avenue Mammoth Cave National Park; National Park Service
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Circa 1942
Caves, gypsum flowers on Morrison Avenue Mammoth Cave National Park; National Park Service
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Circa 1942
Caves, gypsum formation on Morrison Avenue Mammoth Cave National Park; National Park Service
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Circa 1942
Closeup of wooden beam in cave, showing mold deposits, possibly part of saltpeter vats Mammoth Cave National Park; National Park Service
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Circa 1935
Gypsum deposits, unknown location in cave Mammoth Cave National Park; National Park Service
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Circa 1935
Gypsum deposits, unknown location in cave Mammoth Cave National Park; National Park Service
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Circa 1935
Gypsum flowers Kings Mountain National Military Park Gypsum Flowers
Gypsum flowers in unidentified area of cave Mammoth Cave National Park; National Park Service
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Circa 1942
Gypsum flowers in unidentified area of cave Mammoth Cave National Park; National Park Service
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Circa 1942
Gypsum flowers in unidentified area of cave Mammoth Cave National Park; National Park Service
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Circa 1942
Gypsum flowers in unidentified area of cave Mammoth Cave National Park; National Park Service
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Circa 1942
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