Statistics for occurrence #1 of “Dr. Letterman” in chapter 1.9 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

... Dr. Letterman
Edward L. Munson, M. D., Major, Medical Department, United States Army however brilliant the t...
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