Collection
- Papers, 1814-1958, and undated5
- Parkhill Family Papers, 1875-1979, and undated5
- Valley Chemical Company (Mount Pleasant, Mich.) Organizational records, 1927-1962, and undated5
- Walter Scott Ryder Papers, 1909-1956, and undated5
- Architectural papers, 1913, 1997, and undated4
- Bay View Association of the Methodist Church Published Materials, 1892-1985, and undated4
- Calvin W. Enders Michigan Ku Klux Klan Research Papers, 1917-1997, and undated4
- Central Michigan University Faculty Dames Organizational Records, 1920-2012, and undated4
- Central Michigan University. College of Education and Human Services Vertical Files Collection, 1892-1998, and undated4
- Central Michigan University. School of Music Collection, 1904-2017, and undated4
- Collection, 1926, 1978, and undated4
- David Smalley, David Smalley Family papers, 1865-20164
- DeTour Reef Light Preservation Society Organizational Records, 1998-2008, and undated4
- Elden L. Brigham Collection, 1883-1992, and undated4
- Fred R. Trelfa Photograph Collection, circa 1860-1961, and undated4
- Heather A. Fuller Papers, 1896-1994, and undated4
- Horn Family Papers, 1914-2022, and undated4
- James Brown Family Papers, 1804-1949, and undated4
- Mary M. Bourgeois Family Papers, 1880-1969 (Scattered), and undated4
- Michigan. Circuit Court (Isabella County) Court records, 1866-1966, and undated4