Statistics for occurrence #1 of “Doc” in year 1863, month September of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

... Major E. W. Stephens, with a portion of the First West-Virginia volunteer infantry, was surprised in his camp at Moorefield, Va., by a party of rebels under the command of Imboden and Jones.--( Doc . 141.) Forts Wagner and Gregg, in Charleston harbor, were furiously bombarded by the National fleet and land batteries, under the command of Admiral Dahlgren and General Gillmore. The firing ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Doc 6,842 2,810 2 0 0 user votes
N. Y. Doc 1,108 0 0 0 0 user votes
Y. S. M. Doc 78 0 0 0 0 user votes
London Doc 4 0 0 0 0 user votes

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