National Museum of American History (U.S.). Archives Center. Register of the Western Union Telegraph Company collection, 1848-1963 / by Robert S. Harding.

National Museum of American History (U.S.). Archives Center.

[Washington, D.C.] : Archives Center, National Museum of American History, Smithsonian Institution, 1990.

Western Union Telegraph Company -- Archives -- Catalogs.

Harding, Robert S. (Robert Steven), 1944-

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