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San Antonio River Walk Flood Gate (San Antonio, Texas)
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San Antonio River Walk Civil Engineering Landmark Plaque (San Antonio, Texas)
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San Antonio River Walk Outstanding Environmental and Engineering Geological Project Plaque (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Outlet (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Outlet Civil Engineering Landmark Plaque (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Outlet (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Inlet (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Civil Engineering Landmark Plaque (San Antonio, Texas)
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San Antonio River Flood Diversion Tunnel Inlet (San Antonio, Texas)
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American Falls and Bridal Veil Falls (Niagara Falls, New York)
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American Falls (Niagara Falls, New York)
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Horseshoe Falls (Niagara Falls, Ontario)
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Horseshoe Falls (Niagara Falls, Ontario)
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Montgomery Bell Tunnel (Cheatham County, Tennessee)
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Montgomery Bell Tunnel (Cheatham County, Tennessee)
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Montgomery Bell Tunnel (Cheatham County, Tennessee)
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Montgomery Bell Tunnel (Cheatham County, Tennessee)
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Ocoee River Suspension Bridge (Polk County, Tennessee)
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Ocoee River Suspension Bridge (Polk County, Tennessee)
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Ocoee River Suspension Bridge (Polk County, Tennessee)
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Ocoee River Suspension Bridge (Polk County, Tennessee)