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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
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 disposal plant (after construction), 1950 Mammoth Cave National Park; National Park Service
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Circa 1950
Sewage disposal plant (after construction), 1950 Mammoth Cave National Park; National Park Service
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Circa 1950
Sewage disposal plant (before construction), 1950 Mammoth Cave National Park; National Park Service
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Circa 1950
Sewage disposal system at campground Blue Ridge Parkway Virginia, Section 1M.
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1965-07-29
Sewage disposal system at campground Blue Ridge Parkway Virginia, Section 1M.
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1965-07-29
Sewage system rehabilitation, Fancy Gap residential area, Blue Ridge Parkway Blue Ridge Parkway Utilities, Fancy Gap Residences, Virginia, Section 1V.
1958-05-05
Construction, sewer line trench completed at superintendents residence, 1940 Mammoth Cave National Park; National Park Service
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Circa 1940
Construction, key area trunk sewer station 37+00, 1939 Mammoth Cave National Park; National Park Service
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1939-05-28
Construction, key area trunk sewer station 40+50, 1939 Mammoth Cave National Park; National Park Service
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1939-03-28
Start of construction of forms for Imhoff tank, 1941 Mammoth Cave National Park; National Park Service
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1941-06
Mabry Mill water and sewage plan and profile Blue Ridge Parkway Virginia, Section 1T.
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1972-06
Construction, sewer line trench in place at superintendents residence, 1940 Mammoth Cave National Park; National Park Service
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Circa 1940
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