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Archival materials
Division of Work and Industry Lantern Slide Collection, 1758-1945, Archives Center, National Museum of American History.
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.2: Bridges -- Cantilever
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.3: Bridges -- Concrete Arch and Beam
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.4: Bridges -- Masonry Aqueducts