The majority of this collection covers the years the Millers spent in Mexico and Central and South America, and extends to their retirement in California. Correspondence from both of the Millers to their daughter Evelyn ranges from 1915 to the late 1940s. There is also correspondence between George Miller and friends and supporters in the U.S., as well as limited administrative correspondence with church leaders in Panama, Costa Rica, Chile, Argentina, and Board of Missions personnel in the U.S. Photographs from the different mission fields make up another large portion of the collection. There also are photographs of the Miller family from the late nineteenth century. The Millers made films and audio tapes of mission work for use in their lectures and presentations in the U.S. These are preserved in collection. The audio tapes are in seven inch reel format. The films are both in original 16mm format and have been copied onto VHS and Beta tapes for viewing. The remainder of the collection is made up of copies of the Miller's various publications, including books and articles, short essays and drafts of published work, as well as collected articles, clippings, newsletters, and essays by other authors on the topic of missions.

The Walter Russell Lambuth collection reflects the Bishop's activities outside the United States in a series of manuscripts, articles and letters. There is one typed manuscript of his book, Medical Missions: The Twofold Task. There is a good chance that most, if not all, of the other typed manuscript articles of Lambuth's trips around the world were published by the Southern Methodist Church in their various periodicals. The correspondence is addressed to family, friends, colleagues and associated groups. Clippings are either death notices and/or tributes for both Lambuth and his wife.

This collection contains scrapbooks and other materials detailing the ministry and life of William Angie Smith, bishop of the Methodist Church. The first part of the collection consists of fifty-nine scrapbooks that document Smith's life from high school until shortly after his retirement from the episcopacy in 1968. While the majority of the material in these scrapbooks encompass the dates listed for each scrapbook, there are exceptions to the rule. Three other scrapbooks attributed to Bess Smith, wife of the Bishop, contain congratulatory letters on the occasion of their retirement. The final segment of the collection is comprised of loose materials that contains his retirement years and portraits. The records themselves illustrate almost every accomplishment Smith achieved whether it be sacred or secular. Methodist related schools in Oklahoma and Texas are well represented. Local church information ends to center on his evangelistic meetings and correspondence with the pastors. Other correspondences are representative of his work with general church boards, jurisdictions and various conferences. Native American work in Oklahoma is strongly represented.