Showing Frozen Niagara entrance to Mammoth Cave after concrete wall has been removed, 1938
Mammoth Cave National Park; National Park Service
Showing Frozen Niagara entrance to Mammoth Cave after concrete wall has been removed, 1938
Mammoth Cave National Park; National Park Service
Construction, looking into cave at Frozen Niagara entrance, box is being pulled into position to drill out remainder of concrete tunnel, 1938
Mammoth Cave National Park; National Park Service
Construction, looking into cave at Frozen Niagara entrance, box is being pulled into position to drill out remainder of concrete tunnel, 1938
Mammoth Cave National Park; National Park Service
Concrete picnic table in campground, Cades Cove, Tennessee, 1960
Great Smoky Mountains National Park
Cades Cove.Table and Bench Combination; Typical, II-A-Gen-3572, Physical Facilities - Minor Structures - Miscellaneous Minor Structures
End view of concrete picnic table in campground, Cades Cove, Tennessee, 1960
Great Smoky Mountains National Park
Standard campground equipment. Caves Cove Campground.Table and Bench Combination; Concrete, II-A-3571, Physical Facilities
Construction, excavation at Frozen Niagara entrance to Mammoth Cave, the concrete tunnel and the dirt from around the rock will be removed but the rock will be left to enhance the landscape, 1938
Mammoth Cave National Park; National Park Service
Concrete footings for block foundation for comfort station, Deep Creek Campground, North Carolina
Great Smoky Mountains National Park
Work order No. B-38 GRSM. Buildings No. 558, 559. Concrete footings for block foundation. Completion report photo.Comfort Stations; Deep Creek Campground, II-C-DC-7207, Physical Facilities - Campgrounds and Picnic Areas - Deep Creek campground
View of concrete bottom of Imhoff tank, Smokemont Campground, North Carolina
Great Smoky Mountains National Park
Work Order No. B-46 GRSM. Concrete bottom of Imhoff tank, showing reinforcing and water stop in construction joints. Completion report photo.Smokemont Campground Sewer System, II-U-Sewer-7381, Physical Facilities - Utilities - Sewer systems
View of completed sludge drying bed with sand and gravel filter, Smokemont campground, North Carolina
Great Smoky Mountains National Park
Work Order No. B-46 GRSM. Sludge drying bed completed with sand and gravel filter. Completion report photo. Smokemont Campground Sewer System, II-U-Sewer-7387, Physical Facilities - Utilities - Sewer systems
View of Imhoff tank, influent pipe, tank, and pump house, Smokemont Campground, North Carolina
Great Smoky Mountains National Park
Work Order No. B-46 GRSM. Imhoff tank, showing 8inch, cast iron influent pipe, tank, and pump house. Completion report photo.Smokemont Campground Sewer System, II-U-Sewer-7384, Physical Facilities - Utilities - Sewer systems
View of Imhoff tank still under construction, Smokemont Campground, North Carolina
Great Smoky Mountains National Park
Work Order No. B-46 GRSM. Imhoff tank showing weir inlet for wet wall and water stop and reinforcing in construction joints for wet wall.Smokemont Campground Sewer System, II-U-Sewer-7382, Physical Facilities - Utilities - Sewer systems
View of Imhoff tank, looking at inlet end, showing concrete baffles, workers at inlet pipe, Smokemont Campground, North Carolina
Great Smoky Mountains National Park
Work Order No. B-46 GRSM. Imhoff tank, looking at inlet end, showing concrete baffles. Completion report photo.Smokemont Campground Sewer System, II-U-Sewer-7383, Physical Facilities - Utilities - Sewer systems
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