The Evangelical United Brethren Church is one of the predecessor denominations of The United Methodist Church. This collection is made up of the administrative material from the Women's Society of World Service. It also includes the records from the Local Branches, Quadrennial Conventions, World Evangel, Literature Department and the Society's area's of emphasis Christian Social Relations. Missionary Education, Missionary Education for children and Youth, and Spiritual Life. The collection is made up of nine series.

Sauer's correspondence, and the manuscript and supporting documents for his unpublished "Methodists in Korea," make up the bulk of the collection. These materials document Methodist Episcopal mission work during Sauer's tenure in Korea, including the evacuation of missionary personnel in 1940, and their return in 1945. This was a critical transition phase for the Korean Methodist Church (KMC) as they struggled for power and control during the heightened Japanese control over churches in Korea, and then rebuilt after the war. There is also considerable material covering state of missions and the KMC during the invasion of South Korea in 1950. Photographs and publications nicely supplement this part of the collection.