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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
View on map 
Circa 1941
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
View on map 
Circa 1941
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
View on map 
1941-12
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
View on map 
1941-12
Construction, enrollees pouring imhoff tank, 1941 Mammoth Cave National Park; National Park Service
View on map 
1941-12
Construction, imhoff tank nearing completion, 1942 Mammoth Cave National Park; National Park Service
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Circa 1941
Tree roots exposed by ditching for sewer line Mammoth Cave National Park; National Park Service
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Tree roots exposed by ditching for sewer line Mammoth Cave National Park; National Park Service
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Construction, sludge bed at imhoff tank, 1942 Mammoth Cave National Park; National Park Service
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Circa 1941
Sewage disposal system at campground Blue Ridge Parkway Virginia, Section 1M.
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1965-07-29
Sewage disposal plant (after construction), 1950 Mammoth Cave National Park; National Park Service
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Circa 1950
Sewage systems for buildings 420, 428, and 429 Blue Ridge Parkway Virginia, Section 1M.
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1958-07-23
Sewage disposal plant (after construction), 1950 Mammoth Cave National Park; National Park Service
View on map 
Circa 1950
Sewage disposal plant (after construction), 1950 Mammoth Cave National Park; National Park Service
View on map 
Circa 1950
Sewage disposal plant (before construction), 1950 Mammoth Cave National Park; National Park Service
View on map 
Circa 1950
Sewage disposal system at campground Blue Ridge Parkway Virginia, Section 1M.
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1965-07-29
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About 260 Items

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