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              Tubular Bridge, through the pipes of which the city of Washington is supplied with water. Built by Gen. M.C. Meigs
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              Potomac Creek Bridge, Aquia Creek & Fredericksburgh Railroad, perspective view, April 12, 1863
            Perspective view of Union Arch, Washington Aqueduct, built by Gen. M.C. Meigs. Span of 220 feet
Perspective view of Union Arch, Washington Aqueduct, built by Gen. M.C. Meigs. Span of 220 feet