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Title page, The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Ser. 1, Vol. XI, Part II (Washington: Government Printing Office, 1884).
Published in 128 volumes between 1881 and 1901, the Official Records, as they are commonly known, remain an indispensable source for Civil War historians and can be invaluable for classroom use as well.