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Dowd Harpsichord Collection, 1949-1997, Archives Center, National Museum of American History.
Archival materials
Eisler Engineering Company Records, Archives Center, National Museum of American History, Smithsonian Institution.
Howard Head Papers / Series 5: Prince Manufaturing Inc. Records
Landy R. Hales Papers, 1908-1969, Archives Center, National Museum of American History.
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.12: Materials Handling
Joseph B. Friedman Papers, 1915-2000, Archives Center, National Museum of American History.
Joseph B. Friedman Papers / Series 2: Invention and Patent Materials / 2.5: Drinking Tube
Scurlock Studio Records, Archives Center, National Museum of American History. Smithsonian Institution
Division of Work and Industry Lantern Slide Collection / Series 1: Engineering / 1.3: Bridges -- Concrete Arch and Beam