Statistics for occurrence #1 of “Captains Dorr” in chapter 12 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.:
...rd General) Morton and Captain Merrill, had enabled General Thomas to take his stand and hold on until he was ready to move against Hood.
The tripod signal in the background was erected by Captains Dorr and Donn, of the United States Coast Survey, in the triangular survey of the triple battlefield for making the official maps.
In the West, the operations of the Federal engineers shed luster on the...
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