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George H. Clark Radioana Collection
Archival materials
William J. Hammer Collection
Division of Transportation Railroad Reference Files, Archives Center, National Museum of American History.
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.14: Railroad Mileage Maps
Division of Work and Industry Lantern Slide Collection, 1758-1945, Archives Center, National Museum of American History.
Mechanical and Civil Engineering Stereograph Cards, Archives Center, National Museum of American History.