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.