The Preston D. Linford papers (1948-2000) consist of correspondence, programs, brochures, notes, and news clippings. Preston D. Linford was an assistant professor of civil engineering at the University of Utah from 1946 to 1975. He began acting in the late 1940s under C. Lowell Lees in Salt Lake City.

The Sherman P. Lloyd papers are comprised of items relating to the congressman's work in the eighty-eighth, ninetieth, ninety-first, and ninety-second congresses. The collection is organized in four sections, with each containing materials compiled during one of Lloyd's congressional terms. The collection also includes scrapbooks, journals and an oral history of Lloyd and his family.

The Charles W. Lockerbie papers (1927-1962) contain field notebooks, bird lists, correspondence, subject files, and scrapbooks. Lockerbie was a Utah ornithologist.

This collection contains letters titled "Professor W. S. Loewe: Greetings on His 75th Birthday" from professors, colleagues, and former students to Walter Siegfried Loewe. Loewe was born in Fuerth, Germany in 1884. He was an Emeritus Research Professor of Pharmacology at the University of Utah. He was best known as a leading authority on the chemical structure of marijuana and its effects on human behavior and physiology.

The Edward G. Lueders papers (1923-2010) contains materials resulting from his work as a poet, teacher, author, and editor. Lueders (1923) spent most of his career as a professor of English.

The Irvin K. Luker papers (1962-1975) consist of materials documenting violations of the anti-noise ordinance of Salt Lake City caused by the auto races at the Utah State Fair Grounds. Included in the collection are correspondence, notes and news clippings.

The Joseph L. Lyon papers (1966-2007) consists of the writings and research of Lyon, an epidemiologist at the University of Utah. His primary area of research was the development of cancer in populations affected by nuclear weapon fallout in areas surrounding the Nevada Test Site.

The Thomas C. Mabey papers (1964-2016) detail his involvement with international and national car racing and car show events. The collection includes materials regarding the activities of Rocky Mountain Motorsports along with general racing ephemera and memorabilia. Mabey is a long-time racer and is also a vintage car collector.

The Dorothy Smith MacFarlane papers (1900-1978) contain correspondence and miscellaneous materials related to MacFarlane's family and friends. A highly respected teacher, she was active in her community and was a member of organizations such as the Utah State Medical Auxiliary and Chapter V of the P.E.O. Sisterhood.

The Brigham D. Madsen papers (1854-2000) contain diaries, correspondence, research files, and manuscripts. In addition, there is primary and secondary source material on the Northwestern Shoshone Indians, most particularly the Shoshone and Bannock, whose tribal lands are now limited to the Fort Hall Indian Reservation in Southeastern Idaho.

The Madsen Furniture Company records (1870-1999) contain correspondence, brochures, pamphlets, news clippings, magazine articles, architectural drawings, financial ledgers, and notes concerning the Madsen Furniture Company. This company was established in Salt Lake City, Utah, in 1870.

The J. R. Mahoney papers (1889-1986) contain materials related to Mahoney, a former professor of economics at the University of Utah. Included in the collection are writings, correspondence, notebooks, travel information, statistics, graphs, and charts, among other materials.

The Beatrice Peterson Marchant papers (1879-2000) contain Marchant's research on the John Birch Society and the Equal Rights Amendment. Included is a paper written by Marchant entitled "The John Birch Society and the Mormon Church." Also included are eleven scrapbooks of correspondence, newspaper articles and pamphlets collected by Mrs. Marchant from 1969 to 1996.

The Fred L. Markham papers (1945-1948) contain a folder of professional correspondence, and two sets of blueprints from the J. C. Penny store in Price Utah. Also included are oversize architectural drawings.

The Allen Dean Marler diary and correspondence (1923-1924) were both written by Marler while serving a mission for the LDS Church in the Eastern United States.

The H. Michael Marquardt papers (1800-2017) contains correspondence, clippings, diary copies, scholarly articles, miscellaneous research materials on topics in LDS history and theology. Marquardt is a historian and author.

The Dan Marriott papers (1975-1984) contains congressional papers including correspondence, case files, bills, files, speeches, and press releases. Dan Marriott served as U.S. Representative from Utah's Second Congressional District, 1976-1984.

The Marriott Employees Staff Association records (1983-2003) consist of materials generated by members of this Marriott Library group, otherwise known as MESA. The records include governing documents (such as by-laws), administrative correspondence, membership information, staff surveys, event planning and announcements, financial records, newsletters and literary magazines, meeting minutes, and miscellaneous items.