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Title: Map of the island of Porto Rico showing the lines of signal communication, telegraph, telephone, and heliograph, operated by the Signals Corps, U.S. Army, with military posts. Year: 1900. Maker: Glassford, William A. Language: English. Size (H x W): 39 x 108. Publication: Glassford, William A. 1900. War Department, Adjuntant General Office, Military Information Division.United States. Army. Signal Corps. Credit: Library of Congress. CM1510.
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