Collection
- Ernest Hemingway Collection, 1901, 2014, and undated316
- Ernest Hemingway correspondence (copies) from the John F. Kennedy Presidential Library, 201919
- Hilda I. Green, Alvin and Hilda Green PBB Collection, 1972-1993, 2022, and undated195
- Isabella County Historical Society Organizational Records, 1972-2023 (Scattered)17
- John C. Pollie Papers, 1910-1969, and undated522
- John Cumming Collection, 1822, 2010, and undated190
- Ken Carstens, Carstens Family Papers, 1843-[2022] (Scattered), and undated141
- League of Women Voters of the Mt. Pleasant Area (Mich.) Organizational records, 1969-2024, and undated84
- New Library Collection, 1996-2008 (Scattered), and undated46
- Norman E. (Norman Ellsworth) Clarke Collection,86
- Organizational Records, 1930-2022, undated724
- Parkhill Family Papers, 1875-1979, and undated48
- Poetry Society of Michigan Organizational records, 1933-2003238
- Posters collection, 1968, 2006, and undated43
- Richard C. Train and Kha Nay Ung Train Collection, 1970-2023 (Scattered), and undated87
- Robert E. Kohrman Angling auction catalogs and books collection, 1885-2023, and undated [majority of material found between 1940-2023]354
- Rochester Ladies' Anti-Slavery Society papers, 1848-1868107
- Rolland Harper Maybee Papers, 1835, 1970, and undated205
- Shelley Dumas Family papers, 1872-2023 (Scattered), and undated31
- Sherry S. Sponseller Michigan history collection, 1872-2018 (Scattered) and undated57