| Alexander Gardner Group military telegraph operators, HQ, Army of the Potomac, Bealton, VA 1863 Albumen print Library of Congress, Prints and Photographs Division Ref: 03771u LL/43001 Chief Telegrapher standing is A.H. Caldwell. I believe there are at least three well known photographers in the photograph but can't prove it. [Dave Tooley, pers. comm. February 2011]
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