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.
Summary
"Based on map furnished by the War Department, Adjuntant General Office, Military Information Division."
Available also through the Library of Congress web site as a raster image.
Tags
Date
01/01/1900
Contributors
Glassford, William A. (William Alexander)
Greely, A. W. (Adolphus Washington), 1844-1935.
United States. Army. Signal Corps.
Source
Library of Congress
Copyright info
Public Domain