Finding aids (8) Images (2)

Archival materials (8) Collection descriptions (8) Manuscripts (4) Black-and-white photographs (3) Brochures (2) Clippings (2) Memorandums (2) Audiotapes (1) Awards (1) Biography files (1) Black-and-white negatives (1) Business letters (1) Business records (1) Compact discs (1) Correspondence (1) Digital images (1) Drawings (1) Electronic records (1) Film reels (1) Financial records (1) Motion pictures (visual works) (1) Nitrate materials (1) Notebooks (1) Notes (1) Patents (1) Personal papers (1) Phonograph records (1) Photographs (1) Professional papers (1) Reports (1) Sound recordings (1)

Journalism, Scientific (3) Science (3) Communication (2) Electrical engineering (2) Physics (2) Radio (2) Astronomy (1) Astrophysics (1) Automobiles (1) Cameras (1) Clocks and watches (1) Contracts (1) Crystal devices (1) Electric batteries (1) Electric circuits (1) Electric generators (1) Electric lighting (1) Electric machinery (1) Electric machines (1) Electric power production (1) Electric power systems (1) Electric power transmission (1) Electrical science and technology (1) Electricity (1) Electromagnets (1) Electron microscopes (1) Electronics (1) Fuel cells (1) Integrated circuits (1) Interlingua (International Auxiliary Language Association) (1) Lasers (1)

National Museum of American History (U.S.). Division of Electricity and Modern Physics (2) American Telephone and Telegraph Company (1) Begun, S. Joseph (Semi Joseph) (1) Bell Telephone Laboratories (1) Cady, Walter Guyton, 1874-1973 (physicist) (1) Espenschied, Lloyd, 1889-? (electrical engineer) (1) James Knights Co. (1) Science Service (1) Smithsonian Astrophysical Observatory. Department of Contracts, Grants and Property Management (1) Telefunken Wireless Telegraph Company. (1)

Archives Center, National Museum of American History (4) Smithsonian Institution Archives (4)