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Yellowstone photo album 31, page 187 Yellowstone National Park
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Circa 1936
View series 
Yellowstone photo album 31, page 186 Yellowstone National Park
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Circa 1936
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Yellowstone photo album 31, page 191 Yellowstone National Park
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Circa 1936
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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 31, page 189 Yellowstone National Park
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Circa 1936
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Yellowstone photo album 24, page 115 Yellowstone National Park
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Circa 1908
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Yellowstone photo album 31, page 190 Yellowstone National Park
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Circa 1936
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View of present manhole No. 13 looking toward new chlorinating house, including present imhoff tank and sludge bed, 1940 Mammoth Cave National Park; National Park Service
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1940-02-15
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
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
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
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