The Joseph Edward Taylor diary [typescript] (1849-1877) consists of brief entires that cover certain events in Taylor's, and his family's, life. The diary covers events in Taylor's life such as converting to the Church of Jesus Christ of Later-day Saints (LDS), in England, his trip aboard a steamer to New Orleans, his travels from Council Bluffs across the plains to Salt Lake City, and the "Utah War" and the impact of the army at Fort Bridger and Camp Floyd.

The George Teasdale papers (1770-1984) contain information regarding George Teasdale, an apostle for the Church of Jesus Christ of Latter-day Saints (LDS). Included in the collection are diaries, patriarchal blessings, correspondence, certificates, agreements, tax and financial documents, property deeds, notes, genealogy charts, and memorabilia. The collection is divided into three sections: personal, family, and religious materials.

The Wanda Clayton Thomas papers (1839-1992) contain materials concerning Wanda Clayton Thomas (1912-1996) and her heritage, concentrating on the descendants of Newell H. Clayton.

The Henry B. Thompson diaries (1899-1900) consist of photocopies of the originals detailing Thompson's mission for the Church of Jesus Christ of Latter-day Saints (LDS Church) in Scotland. In these diaries, Thompson describes the challenges that he faced as a missionary. Thompson was appointed president of the Scottish Conference in May 1900 and returned to Utah in June of 1901.

The James Thompson diary (1887-1889) consist of a transcribed copy of the original diary of a missionary for the Church of Jesus Christ of Latter-day Saints. Accompanied by photocopies of family correspondence and genealogical records.

The Vinzenz Thum diary (1919-1922) is handwritten and was kept while on a mission for the LDS Church in Canada and eastern United States.

The Eva Lewis Tiemersma papers (1922-1924) consist of a diary (1922-1924), mission letters, and memorabilia from an LDS mission to the Eastern United States.

Incomplete diary (1963) of an LDS missionary, Kurt Randolph Wegner, to the South German Mission.

The John Max Wendel papers (1927-1953) consist of correspondence, journals, and other materials detailing his experience serving a mission in Germany for the Church of Jesus Christ of Latter-day Saints.

The Emil Morris Whitesides papers (1917-2003) consist of personal correspondence during his participation in World War I (1917-1919), along with an autobiography titled, Things I Remember Most and Things I have Been Told. The autobiography was compiled in 2003 by Whitesides descendants and tells about his experience in the military, his missionary work, family life, and various activities.

The J. K. Whitney letters [photocopies] (1865-1966) consist of three short letters to Horace K. Whitney of Salt Lake City from his brother, J. K. Whitney, who was serving a mission for the LDS Church in Dundee, Scotland.

The Charles Willden family papers (1949-1963) consist of materials primarily relating to Charles (1806-1883) and Elliott Willden, Charles' son. Included is a biography of Charles Willden, an early settler of southern Utah, compiled by his great granddaughter, Jennie Jensen Hancock. The biography includes diary extracts from an LDS mission to England in 1847 and family group sheets. Also included is a biography of his son, Elliott Willden, by Manila May Willden Hardy.

The Joseph S. Willes biography on William Willes consist of a brief biographical sketch of the life of William Willes, with excerpts from several journals kept by him, by Joseph S. Willes, a grandson. The subjects summarized give a biographical sketch of Willes' conversion to the Church of Jesus Christ of Latter-day Saints in England, persecution he suffered as a result, his mission to India and England, and his life in Utah.

The Alfred Douglas Young autobiography (1808-1843), while mainly an account of the visions of Alfred Young, it also records the missionary activities of Alfred and his brother William in Tennessee, the brothers subsequent disfellowship from the Church of Jesus Christ of Latter-day Saints (LDS Church) in 1842 at Nauvoo, and their reinstatement to the church.