Collection
- John R. Stiles papers, 1958-19651
- John Warner Fitzgerald papers, 1952-19821
- John Wesley Longyear Papers, 1837-18751
- Junius E. Beal Papers, 1869-19461
- Kendall Wingrove papers, 1983-2005 (majority within 1987-1999)1
- Kennedy family papers, 1860s-19821
- L. Brooks Patterson papers, 1975-20071
- Lawrence B. Lindemer papers, 1954-1977, 1981-1982 (majority within 1964-1976 and 1981-1982)1
- Lee Kefauver Papers, 1970-1985 (majority within 1972-1977)1
- Lenore LaFount Romney Papers, 1960-1974 (majority within 1962-1970)1
- Lorraine Beebe Papers, circa 1920-19811
- Louis C. Cramton Papers, circa 1865-1966 (majority within 1916-1965)1
- Louis Carlisle Walker papers, 1881-19631
- Louis H. Fead papers, 1900-1948 (majority within 1918-1942)1
- Lucia Isabelle Voorhees Grimes Papers, 1900-19771
- Marion L. Burton Papers, 1895-1925 (majority within 1921-1925)1
- Marshall L. Cook and William R. Cook papers, 1880-19451
- Michigan Political History Society oral history collection, 1995-20131
- Oliver Lyman Spaulding papers, 1861-19211
- Owen J. Cleary Papers, 1944-19591