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World War II Lookout Tower [07]
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World War II Lookout Tower [05]
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World War II Lookout Tower [06]
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World War II Lookout Tower [03]
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World War II Lookout Tower [04]
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World War II Lookout Tower [01]
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World War II Lookout Tower [02]
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Federal Reserve Bank building [08]
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Federal Reserve Bank building [07]
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Federal Reserve Bank building [06]
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CoStar, Federal Reserve, and Riverfront Plaza buildings
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Fire alarm at Trenton Park & Ride [02]
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Fire alarm at Trenton Park & Ride [01]
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View from Loudoun Gateway parking garage
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Fire alarm at the Sunsphere [02]
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Fire alarm at the Sunsphere [01]
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Duncan School of Law at Lincoln Memorial University
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American Public University System building
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Federal Signal Model 5 siren on the Hanover Street Bridge
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Richmond skyline from the James River [02]
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Richmond skyline from the James River [01]
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Federal Reserve Bank building [05]
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Federal Reserve Bank building [03]
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Federal Reserve Bank building [04]
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Federal Reserve and Riverfront Plaza [02]
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US Route 1 and CSX bridges over the Occoquan River [04]
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US Route 1 and CSX bridges over the Occoquan River [02]
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US Route 1 and CSX bridges over the Occoquan River [03]
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US Route 1 and CSX bridges over the Occoquan River [01]
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Fire alarm pull station at New Street parking garage [08]
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Fire alarm pull station at New Street parking garage [07]
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Fire alarm pull station at New Street parking garage [06]
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Fire alarm horn/strobe at New Street parking garage [02]
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Fire alarm horn/strobe at New Street parking garage [01]
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Water pressure gauge on a fire standpipe system [03]
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Water pressure gauge on a fire standpipe system [02]
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Water pressure gauge on a fire standpipe system [01]
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Track at Rhode Island Avenue, facing north
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Green Line train crosses bridge over Paint Branch Trail
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Box culvert under CSX tracks
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Washington Metro bridge over Paint Branch Trail
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Peace sign on a bridge pier
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Pedestrian bridge over railroad tracks [06]
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Pedestrian bridge over railroad tracks [03]
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Pedestrian bridge over railroad tracks [04]
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Pedestrian bridge over railroad tracks [05]
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Pedestrian bridge over railroad tracks [01]
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Pedestrian bridge over railroad tracks [02]
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WMATA Breda 3000-Series car on D Route Bridge