The majority of this collection deals with land cases in Walker and San Jacinto counties, with much focus on early Walker County. The correspondence reflects both legal and personal communication. The collection also contains some Civil War related correspondence, dating from 1862-1864. This includes many thank you letters that McKinney sent to donors of medicine or other supplies to soldiers of the 13th Texas Volunteers. There are thirty-one (31) Letter Books with copies of all correspondence written by McKinney from 1869-1906. Journals and other materials related to McKinney’s time in the House of Representatives as well as court proceedings in the Court of Civil Appeals and the Supreme Court of Texas are also included.