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John Philip Sousa Bridge [01]
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John Philip Sousa Bridge [02]
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John Philip Sousa Bridge [03]
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John Philip Sousa Bridge [04]
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John Philip Sousa Bridge [05]
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K Street under Washington Circle
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Kittatinny Mountain Tunnel [03]
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Kittatinny Mountain Tunnel [04]
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Kittatinny Mountain Tunnel [05]
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Kittatinny Mountain Tunnel [06]
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Kittatinny Mountain Tunnel [07]
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Kittatinny Mountain Tunnel [08]
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Low clearance sign at West Falls Church station
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Lynne Moran
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Mahoning Avenue at Meander Creek Reservoir [01]
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Mahoning Avenue at Meander Creek Reservoir [02]
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Main and Broad Streets, facing east
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Manchester Bridge from Potterfield Bridge
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Maryland Midland Railway track [13]
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Maryland Midland Railway [01]
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Maryland Midland Railway [03]
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Maryland Midland Railway [04]
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Monitor-Merrimac Memorial Bridge-Tunnel [01]
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Monitor-Merrimac Memorial Bridge-Tunnel [02]
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Monitor-Merrimac Memorial Bridge-Tunnel [03]
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Monitor-Merrimac Memorial Bridge-Tunnel [04]
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Monitor-Merrimac Memorial Bridge-Tunnel [05]
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Monitor-Merrimac Memorial Bridge-Tunnel [06]
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Monitor-Merrimac Memorial Bridge-Tunnel [07]
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Monitor-Merrimac Memorial Bridge-Tunnel [08]
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Monitor-Merrimac Memorial Bridge-Tunnel [09]
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Monitor-Merrimac Memorial Bridge-Tunnel [10]
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Monitor-Merrimac Memorial Bridge-Tunnel [11]
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Monitor-Merrimac Memorial Bridge-Tunnel [12]
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Montgomery Village Avenue interchange on Interstate 270 [01]
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Montgomery Village Avenue interchange on Interstate 270 [02]
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Mouth of the Trent River [01]
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Mouth of the Trent River [02]
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Panhandle Bridge
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Pennsylvania Route 641 at the turnpike
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Pittsburgh skyline from Three Rivers Heritage Trail [01]
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Pittsburgh skyline from Three Rivers Heritage Trail [02]
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Point of Rocks Bridge [01]
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Point of Rocks Bridge [02]
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Point of Rocks Bridge [03]
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Point of Rocks Bridge [04]
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Point of Rocks Bridge [05]
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Point of Rocks Bridge [06]
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Point of Rocks Bridge [07]
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Point of Rocks Bridge [08]
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Point of Rocks Bridge [09]
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Point of Rocks Bridge [10]
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Point of Rocks Bridge [11]
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Point of Rocks [01]
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Point of Rocks [04]
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Potomac River
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Potomac River from US 340 bridge [03]
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Potomac River from US 340 bridge [04]
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Potomac River from US 340 bridge [05]
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Rail bridge over the Rappahannock River [01]
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Rail bridge over the Rappahannock River [02]
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Rail bridge over the Rappahannock River [03]
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Ramp to Downtown Expressway [01]
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Ramp to Downtown Expressway [02]
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Robert B. Scarborough Bridge [01]
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Robert B. Scarborough Bridge [02]
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Robert B. Scarborough Bridge [03]
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Robert B. Scarborough Bridge [04]
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Robert B. Scarborough Bridge [05]
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Robert B. Scarborough Bridge [06]
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Robert B. Scarborough Bridge [07]
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Robert B. Scarborough Bridge [08]
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Robert E. Lee Memorial Bridge
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Robert E. Lee Memorial Bridge and Belle Isle pedestrian bridge [01]
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Robert E. Lee Memorial Bridge and Belle Isle pedestrian bridge [02]
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Roberto Clemente Bridge [01]
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Roberto Clemente Bridge [02]
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Roberto Clemente Bridge [03]
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Rocks in the Potomac River [01]
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Rocks in the Potomac River [02]