Erwin Hart Richards was a Congregational missionary for thirty-three years in South East Africa. The collection consists of correspondence from the period when Richards was treasurer of the Board of Foreign Missions for the Methodist Episcopal Church.

This collection contains correspondence, reports, and teaching materials of Frank C. Laubach, a Christian missionary and educator who played a prominent role in world literacy by establishing the "Each One Teach One" literacy teaching method and founding the Committee on World Literacy and Christian Literature (FMCNA and NCC), World Literacy, Inc., and Laubach Literacy, Inc.

George Merriam Newell had a 37-year career as a school teacher and missionary in Fuzhou 福州, Fujian 福 建 province, China. The collection contains correspondence, reports, maps, and publications.

John J. Banninga was an American Board of Commissioners for Foreign Missions (ABCFM) Missionary to India. The collection contains correspondence, reports, memoranda, clippings, and other documents related to the creation of the Church of South India (CSI), a union among Anglican, Methodist, and the South India United Churches, as well as personal papers.

Joseph Kingsbury Greene was an American Board of Commissioners for Foreign Missions Congregational missionary in Turkey for fifty-one years, stationed in Nicodemia, Bursa, and Manisa. He was fluent in Armenian and Turkish languages. The collection contains Greene's diaries from 1859 through 1917, Greene's correspondence with members of the American Board of Commissioners for Foreign Missions and others, and Greene's handwritten English and Armenian dictionaries.