The American electro-magnetic telegraph [microform] : with the reports of Congress, and a description of all the telegraphs known, employing electricity or galvanism /
Vail, Alfred,1807-1859.
Philadelphia : Lea & Blanchard,
1847.
Filmed from the holdings of the Huntington Library, San Marino, California.
Sabin 98291.
Sabin Unit 140.
SCI-052.
Microfiche.
Telegraph
Telegraph