Statistics for occurrence #1 of “Doc” in year 1861, month December of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

...ve Newport News, Va. The bombardment lasted about two hours, commencing at five o'clock in the morning. The rebel steamer kept close to the shore, where a powerful battery assisted it materially.--( Doc . 209.) In the convention of Western Virginia, in session at Wheeling, Mr. Hagan, of Boone County, offered the following resolution, which was referred to the Committee on Fundamental and Genera...
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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