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Construction, hotel sewer, looking down hill from station 3+75, 1938 Mammoth Cave National Park; National Park Service
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1939-11-10
Construction, location of proposed imhoff tank and sludge bed, 1940 Mammoth Cave National Park; National Park Service
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1940-02-15
Construction, location of proposed imhoff tank and sludge bed, 1940 Mammoth Cave National Park; National Park Service
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1940-02-15
Tree roots exposed in ditching for sewer line, cabin unit No. 1 Mammoth Cave National Park; National Park Service
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Tree roots exposed by ditching for sewer line, protected with burlap wrapping Mammoth Cave National Park; National Park Service
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Tree roots exposed by ditching for sewer line, protected with burlap wrapping Mammoth Cave National Park; National Park Service
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Tree roots exposed by ditching for sewer line, protected with burlap wrapping Mammoth Cave National Park; National Park Service
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Tree roots exposed by ditching for sewer line, protected with burlap wrapping Mammoth Cave National Park; National Park Service
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Construction of chlorinating house on Mammoth Cave sewer line, 1939 Mammoth Cave National Park; National Park Service
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1939-11-15
Sewer line. Smokemont Campground Sewer System, Construction picture Great Smoky Mountains National Park Sewer line.Smokemont Campground Sewer System; Construction picture, II-U-Sewer-5195, Physical Facilities - Utilities - Sewer systems
Completed sewage disposal tanks, removable top slabs over leaching pit shown in background, 1940 Mammoth Cave National Park; National Park Service
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1940-02-15
Stone chlorinating house under construction on Mammoth Cave sewer system, 1939 Mammoth Cave National Park; National Park Service
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1939-10-30
Yellowstone photo album 30, page 27 Yellowstone National Park
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Circa 1937
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Yellowstone photo album 31, page 188 Yellowstone National Park
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Circa 1936
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Construction, excavation for Imhoff tank, rail fence has been erected around the hole Mammoth Cave National Park; National Park Service
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Circa 1941
Aerial view of Columbia Municipal Sewage Plant outfall, Congaree National Park Congaree National Park Columbia Municipal Sewage Plant Outfall, Aerial View
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Tree roots exposed in ditching for sewer line, cabin unit No. 1, protected by straw Mammoth Cave National Park; National Park Service
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Feasibility, Suitability and Value Analysis Review of Old Faithful Wastewater Treatment Alternatives for Yellowstone National Park National Park Service Water Resources Division; National Park Service
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1998-08-03
Environmental assessment for a sewage treatment plant and expanded water storage facilities National Park Service Water Resources Division; National Park Service
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Tree roots exposed in ditching for sewer line, cabin unit No. 1, protected with burlap wrapping Mammoth Cave National Park; National Park Service
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