Statistics for occurrence #1 of “Major, Surgeon” in chapter 5 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 2:

...h Mass. Infantry, May 15, 1863. Mustered out, July 2, 1865. First Lieutenant, Assistant Surgeon, 36th Mass. Infantry, Aug. 29, 1862. Major, Surgeon, 58th Mass. Infantry, Aug. 12, 1864. Major, Surgeon , 36th Mass. Infantry, May 1, 1865. Mustered out, June 8, 1865. Major, Surgeon, 20th Mass. Infantry, July 1, 1861. Major, Surgeon, U. S. Volunteers, Aug. 3, 1861. See United States Army...
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