Statistics for occurrence #1 of “Forts Totten” in chapter 6, page 94 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

... point of the line of works. Fort Stevens, commanding the Seventh Street Road, running north, and Fort Lincoln, commanding the Baltimore turn-pike and the Baltimore and Ohio Railroad, together with Forts Totten and Slocum, between these latter roads and the Seventh Street Road, were all simultaneously started. All these works were on the crest of a somewhat irregular ridge overlooking the valley of Sligo ...
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