Statistics for occurrence #1 of “F. G. Bolles” in chapter 29 of Isaac O. Best, History of the 121st New York State Infantry:

...3; 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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