The David McKenzie papers (1860-1962) include early programs, playbills, tickets, scripts, librettos, and other materials related to the Salt Lake Theater, as well as some personal papers of David McKenzie (1833-1912), manager of the theater.

The Blanche Kendall McKey papers (1892-1971) illustrate the personal and professional life of this actress, playwright, and drama teacher.

The Sterling M. McMurrin papers (1830-2001) chronicle McMurrin's life as family man, student, educator, administrator, U.S. Commissioner of Education, philosopher, observer and critic of Western culture and religion, and participant in LDS culture. The papers (1830-2006) consist of correspondence, scrapbooks, daily planners, interviews, academic materials, governmental papers, speeches, lectures, publications, manuscripts, and awards.

The Trudy McMurrin papers (1964-2007) contain correspondence, administrative files and manuscripts compiled during McMurrin's tenure as an editor for various authors and presses.

The Nathan Cook Meeker papers (1873-1879) consist of transcribed correspondence and telegrams, copied onto a microfilm reel, from Meeker and his predecessors, including Charles Adams, at the White River Indian Agency in Colorado. Much of the material surrounds the events of the Meeker massacre.

The Mitchell Melich papers (1932-1973) contain correspondence, cards, handwritten notes, notebooks, appointment books, travel itineraries, calendar books, passports, general Republican Party materials, mining materials, gubernatorial campaign materials, financial documents, and news clippings. This collection covers four main portions of Melich's life: mining, gubernatorial campaign, service in the Republican Party, and Solicitor of the Department of Interior.

The David Merrill papers (1962-2008) contain correspondence, manuscript drafts, magazine covers and proofs, advertisements, and artwork. Merrill was art director for Time magazine. He started his own design business, wrote several unpublished novels, and was a landscape painter.

The Eugene H. Merrill papers (1935-1976) contain correspondence, personal certificates, pamphlets, and other documents. Merrill was a communications expert in the U.S. Army.

The Joseph F. Merrill papers (1898-1952) contain articles, speeches, pamphlets, radio talk transcripts, class instruction texts and notes. Joseph F. Merrill (1868-1952) was an engineering professor at the University of Utah and later became an apostle in the Church of Jesus Christ of Latter-day Saints (LDS Church).

The Stephanie Young Merzel papers (1861-1948) are photocopies and transcripts of correspondence between Joseph Franklin Barton and his son, Morgan Amasa Barton, while the father was in prison for polygamy. There is also a family history by Morgan Amasa Barton, titled "The Back Door to San Juan," which discusses the family's journey through Hole in the Rock in 1855.

The Michigan Communist Party collection (1924-1935) consist of flyers, handbills, and publications of regional leftist organizations in Michigan. The flyers promote rallies, marches, and other events focused on social equality and economic relief, and encourage membership in the Communist Party of the United States (CPUSA), unions, and various community groups.

The David E. Miller papers (1831-1981) contain such things as correspondence, history course papers and detailed lessons, his journal from his years as an LDS missionary in Germany (1930-1931), Golden Spike Centennial (1969) materials, newspaper clippings, book reviews, various publications, maps, and research and a manuscript for his work on Peter Skene Ogden.

The Hack Miller papers (1937-1996) contain newspaper articles, magazine stories, trip diaries, office files, and correspondence pertaining to the career of this Utah journalist.

The Lorille Horne Miller papers (1938-1991) contain correspondence, newsletters, meeting agendas, maps, and pamphlets related to the 1977 National Women's Conference in Houston, Texas. In addition, there are news clippings related to the activities and membership of the First Unitarian Church from 1938-1946.

The Robert L. Miller papers (1832-2008) contain information regarding Miller's life, as well as collected research regarding the Latter-day Saint Church, science, evolution, and Henry Eyring. The collection contains correspondence, handwritten notes, printed materials, journal entries, bound works, various articles, newspaper clippings, bibliographic materials, etc.

The Susan Miller papers (1985-1997) contain some of her professional writing and publishing correspondence, teaching materials, and conference materials. Miller was a nationally renowned scholar and author. She published many books and essays on composition pedagogy and rhetorical theory.

The Wick Miller papers (1931-1994) contain correspondence, research files, field notes, word lists, notebooks, articles and reprints, pamphlets, maps, class syllabi, tests and assignments, student papers, and manuscripts. Wick Miller (1932-1994) was an anthropological linguist and pioneer in language acquisition studies.

The A. Selden Millward correspondence (1926) consists of letters, some from B. H. Roberts, regarding the management of the Eastern States Mission. Millward was a native of Utah who served as president of the Eastern States Mission of the LDS Church.