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S-13A Structure Improvements and Hydraulic Design Technical Publication ERA-463; Appendix A Hydraulic Model for Flow Regulation through the S-13A Structure through the S-13A Structure ; "January 2008."
Notes, Castillo de San Marcos National Monument, Florida Castillo de San Marcos National Monument
Yellowstone photo album 8, page 54 Yellowstone National Park
Loop Tunnel construction, circa 1935 Great Smoky Mountains National Park Loop Tunnel; Construction; II-S-16190, Physical Facilities - Roads - Structures on roads (tunnels, trail underpass, box culverts, trestles).
Circa 1935
Floodlighting, Castillo de San Marcos National Monument, Florida Castillo de San Marcos National Monument
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1960-09-06
Existing, Castillo de San Marcos National Monument, Florida Castillo de San Marcos National Monument
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1978-08-21
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1976-09-01
Yellowstone photo album 8, page 53 Yellowstone National Park
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1976-09-01
Plumbing plan, Castillo de San Marcos National Monument, Florida Castillo de San Marcos National Monument
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1976-09-01
Bridge Construction, Newfound Gap Road, circa 1934 Great Smoky Mountains National Park Bridge Construction; Newfound Gap Road; II-F-(4)-NFG-16204, Physical Facilities - Footlogs and Bridges - Bridges on Newfound Gap Road.
Circa 1934
Tunnel construction, Newfound Gap Road, circa 1934 Great Smoky Mountains National Park Tunnel construction; Newfound Gap Road; II-S-16202, Physical Facilities - Roads - Structures on roads (tunnels, trail underpass, box culverts, trestles).
Circa 1934
Proposed grade separation plan and elevations at Montebello Road Blue Ridge Parkway Virginia, Section 1D.
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1939-03-20
Proposed grade separation plan and elevations at Montebello Road Blue Ridge Parkway Virginia, Section 1D.
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1939-01-06
Yellowstone photo album 11, page 27 Yellowstone National Park

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