Turnbull, L. (1852). Lectures on the electro-magnetic telegraph: with an historical account of its rise and progress, containing a list of the number of telegraphic lines of the world. Philadelphia: R. W. Barnard, printer.MLA Citation
Turnbull, Laurence, 1821-1900. Lectures On the Electro-magnetic Telegraph: With an Historical Account of Its Rise And Progress, Containing a List of the Number of Telegraphic Lines of the World. Philadelphia: R. W. Barnard, printer, 1852.
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