Statistics for occurrence #1 of “Illinois” in chapter 4.10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...icipated the Confederate gunboats coming up the Mississippi might visit upon it, and thus gain access to the Ohio. It was tedious work for the men of the Eighth, Ninth, Tenth, Eleventh, and Twelfth Illinois Volunteers, who, began the building of barracks, cleared parade grounds, mounted guns, and threw up fortifications against the attack which never came. In the upper pictures the men are at work rus...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Illinois (Illinois, United States) 6,200 22 0 0 0 user votes
Illinois (New Mexico, United States) 4 0 0 0 0 user votes
Illinois (Oregon, United States) 2 0 0 0 0 user votes
Illinois (Colorado, United States) 0 0 0 0 0 user votes
Illinois (Illinois, United States) 0 0 0 0 0 user votes
Illinois (New Mexico, United States) 0 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.