Statistics for occurrence #1 of “Iowa” in chapter 6 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

...ta2062066 Delaware11,2369495412,284882 District of Columbia11,9121,3533,26916,534290 Florida1,2901,990215 Georgia15 Illinois255,0572,2241,811259,09234,834 Indiana193,7481,0781,537196,36326,672 Iowa 75,797544076,24213,001 Kansas18,0692,08020,1492,630 Kentucky51,74331423,70375,76010,774 Louisiana5,2245,224945 Maine64,9735,03010470,1079,398 Maryland33,9953,9258,71846,6382,982 Massachusetts122...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Iowa (Iowa, United States) 1,742 12 0 0 0 user votes
Iowa (Iowa, United States) 0 0 0 0 0 user votes
Iowa (Louisiana, United States) 0 0 0 0 0 user votes
Iowa (Pennsylvania, 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.