Welcome to the Civil War in the Trans-Mississippi! This is a place where all who share an interest in the Civil War fought west of the Mississippi River can gather to ask questions, share information, and announce news.
There is a book HISTORY OF THE 112TH REGIMENT OF ILLINOIS VOLUNTEER INFANRY, by B. F. Thompson. Original copies are probably pretty rare and expensive, but the Higginson Book Company has reprinted it for something like $45. You can contact them at 978-745-7170.
Clark