[source: A list of immigrants who applied for naturalization papers in the District Courts of Allegheny County, Pa. Volume 3: 1856-1869. Compiled by members of the Western Pennsylvania Genealogical Society. Pittsburgh, Pennsylvania: Western Pennsylvania Genealogical Society, 1978]
[This does not have an index by regiment; I may well have missed some relevant entries]
[I also noted other names that matched men in the regiment associated with Alleghany County, Pennsylvania, but the connections were too dubious for me to transcribe them]
[SA = soldiers' application; the other abbreviations are obvious enough]
[page 13]
CHILDS, James (1868) Res: West Deer Twp., Alleg. Co.; Bn: Eng.; (SA) En: 14 Mar 1865, Com. I, 91st, Pa. Vols.; Dis: 10 Jul 1865; Nat: 3 Oct 1868; Sp: Clark KISSIC
[page 25]
FRITZ, George (1866) Bn: Germ., Baden; (SA) En: 17 Mar 1865, Com. G, 91st Reg., Pa. Vols.; Dis: 10 Jul 1865; Nat: 24 Sept 1866; Sp: Louis FRITZ
[page 81]
[uncertain identification]
STOLTA, Frederick (1860) Bn: Germ., Lippe Scharmburg; DI: 22 Feb 1858; Nat: 3 Oct 1860; Sp: (illegible)