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1. 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.

Notes:
ix, 140, 46 p. illus., plates. 23 cm.
Data Provider:
University of Michigan. Libraries
Collection:
Philadelphia,: R. W. Barnard, printer, and Ann Arbor, Michigan: University of Michigan Library