Statistics for occurrence #1 of “C. H. Barr” in chapter 29 of Isaac O. Best, History of the 121st New York State Infantry:
... First Lieutenants: B. F. Park, August 23, 1862 to March 18, 1863; A. C. Rice, April 10 to September 20, 1863; S. E. Pierce, January 26 to May 13, 1864; H. C. VanScoy, May 3, 1864 to January 1, 1865; C. H. Barr , January 1 to June 25, 1865.
Second Lieutenants: F. G. Bolles, August 23, 1862 to January 30, 1863; S. E. Pierce, April 10, 1863 to January 26, 1864.
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