Statistics for occurrence #1 of “Colonel N. Michler” 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.:

... of the Union, there were but few reliable maps. Consequently, this information had to be obtained in advance of the army. A party composed of regular and volunteer officers and soldiers, under Colonel N. Michler , of the Engineer Corps, was directed to undertake this work. Their labors commenced after crossing the Rapidan. Every road within the lines of the army had to be surveyed and mapped, and the work...

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