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115
Topography and alignment, north and south portals of Ferrin Knob tunnel #3, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North Carolina Section 2S.
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North and South portals of Little Pisgah Tunnel, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North & South Portals - Little Pisgah Tunnel, North Carolina Section 2T.
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1964-01-07
Final drawing of portals of Ferrin Knob tunnel #2, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North & South Tunnel Portals, Ferrin Knob #2 (401.3), North Carolina Section 2S.
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1963-12-06
Final drawing of portals of Ferrin Knob tunnel #3, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North & South Tunnel Portals, Ferrin Knob #3 (401.5), North Carolina Section 2S.
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1963-12-06
Man-made tunnel Jean Lafitte National Historical Park and Preserve
1980
Photograph of people in old tunnel Jean Lafitte National Historical Park and Preserve
Circa 1986
Mary's Rock Tunnel, Shenandoah National Park, Virginia Kings Mountain National Military Park Mary's Rock Tunnel
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Mary's Rock Tunnel, Shenandoah National Park, Virginia Kings Mountain National Military Park mars Rock Tunnel, South portal
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Ring stone detail Blue Ridge Parkway Virginia, Section 1G.
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1956-06-04
Tunnel topographic study Blue Ridge Parkway Virginia, Section 1G.
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1956-06-01
South portal of tunnel at station 778, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North Carolina Section 2P.
Tunnel portal plan and elevation Blue Ridge Parkway Virginia, Section 1G.
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1956-06-01
Structural Inspection and O National Park Service Water Resources Division; National Park Service
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1993-08
Tunnel portal dimensioned masonry, Blue Ridge Parkway, North Carolina Blue Ridge Parkway Tunnel Portal Dimensioned Masonry - 2P5, North Carolina Section 2P.
1950-05-15
Old stone tunnel under leaves South Carolina State Parks Written on slide: 14
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Yellowstone photo album 7, page 73 Yellowstone National Park
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Circa 1925
View series 
Tunnel portal plan and elevation Blue Ridge Parkway Tunnel Portal #2, Sta 162+38.5, Virginia, Section 1G.
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1956-02-01
Tunnel portal ring stone detail Blue Ridge Parkway Tunnel Portal #2, Sta 162+38.5, Virginia, Section 1G.
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1956-02-02
Feature brick wall or tunnel underground South Carolina State Parks Written on slide: 1
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Craggy flats tunnel north portal, Blue Ridge Parkway, North Carolina Blue Ridge Parkway North Carolina Section 2P.
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Items per page (20):
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About 150 Items

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