Extracts from the proceedings to the board of the Smithsonian Institution in relation to the electro-magnetic telegraphv. 2No. 2Smithsonian Institution1–39
Smithsonian Institution. 1861. "Extracts from the proceedings to the board of the Smithsonian Institution in relation to the electro-magnetic telegraph." Smithsonian Miscellaneous Collections, 2, (2) 1–39.