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Page 1 of at least 6
About 260 Items

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Waterworks, sewage disposal tank completed, 1942 Mammoth Cave National Park; National Park Service
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1942-06
Waterworks, sewage disposal tank completed, 1942 Mammoth Cave National Park; National Park Service
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1942-06
Yellowstone photo album 12, page 64 Yellowstone National Park
Yellowstone photo album 12, page 63 Yellowstone National Park
Yellowstone photo album 12, page 65 Yellowstone National Park
Yellowstone photo album 12, page 67 Yellowstone National Park
Sewage pump installation Jean Lafitte National Historical Park and Preserve
Circa 1980
Yellowstone photo album 12, page 50 Yellowstone National Park
Yellowstone photo album 12, page 92 Yellowstone National Park
Yellowstone photo album 12, page 68 Yellowstone National Park
Yellowstone photo album 12, page 56 Yellowstone National Park
Yellowstone photo album 12, page 97 Yellowstone National Park
Yellowstone photo album 12, page 79 Yellowstone National Park
Yellowstone photo album 12, page 59 Yellowstone National Park
Yellowstone photo album 12, page 76 Yellowstone National Park
Yellowstone photo album 12, page 60 Yellowstone National Park
Yellowstone photo album 12, page 57 Yellowstone National Park
Yellowstone photo album 12, page 61 Yellowstone National Park
Yellowstone photo album 12, page 62 Yellowstone National Park
Yellowstone photo album 12, page 49 Yellowstone National Park
Yellowstone photo album 12, page 89 Yellowstone National Park
Yellowstone photo album 12, page 52 Yellowstone National Park
Yellowstone photo album 12, page 78 Yellowstone National Park
Imhoff tank construction, 1941 Mammoth Cave National Park; National Park Service
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1941-06
Imhoff tank construction, 1941 Mammoth Cave National Park; National Park Service
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1941-06
Imhoff tank construction, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
View on map 
Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
View on map 
Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Imhoff tank under construction, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
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Circa 1941
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
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1941-12
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
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1941-12
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
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1941-12
Construction, imhoff tank nearing completion, 1942 Mammoth Cave National Park; National Park Service
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Circa 1941

Page 1 of at least 6
About 260 Items

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National Park Service
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Clemson University