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

...llet, commanding the ram fleet in Western water, while on a reconnoissance on the Red River, was fired on, near Gordon's Landing, by a battery of four guns, and subsequently captured by the rebels.--( Doc . 105.) Mound City, Arkansas, was burned by a detachment of National troops, the place having long been the resort of guerrillas.--The bill authorizing the issue of one hundred million doll...
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

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.