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[This information is from Vol. IV, pp. 437-459 of A Record of the Commissioned Officers, Non-commissioned Officers and Privates, of the Regiments which were organized in the State of New York and called into the service of the United States to assist in supressing the rebellion caused by the secession of some of the Southern States from the Union, A. D. 1861, as taken from the Muster-in Rolls on file in the Adjutant General's Office, S. N. Y., (Albany, N. Y.: Comstock & Cassidy, Printers, 1864). It is in the Reference collection of the Johnstown Public Library at LHR 973.7 N531, and page images may be viewed via the University of Michigan's Making of America project and Google Books.]
125th Infantry Regiment, Civil War — includes bibliography and excerpts from Frederick Phisterer's New York in the War of the Rebellion (New York State Military Museum)
125th NYSV (Sue Greenhagen, Morrisville State College)
Brief service records of soldiers are contained in Registers of New York Regiments in the War of the Rebellion (Annual Report of the Adjutant-General of the State of New York for the Year 1903, Volume 5, pp. 667-853).
Available at the New York State Library
Available online from the New York State Military Museum [6.8 MB download, free PDF viewer required]
Regiment's service at the Battle of Gettysburg in Final Report on the Battle of Gettysburg, Vol. II, pp. 879-894, by the New York Monuments Commission for the Battlefields of Gettysburg and Chattanooga. [Albany: J. B. Lyon Co. Printers, 1900]
Available in the Genealogy Room of the Middleburgh Library at R S XI 18.2
Available online from the New York State Library as the second part of Vol. II [12.6 MB download, free PDF viewer required]
Simons, Ezra De Freest. A Regimental History: The One Hundred and Twenty-fifth New York State Volunteers. (New York: E. D. Simons, 1888)
Available in the Troy Public Library at TR 973.7447 S.