Collection
- Brecken Family papers, 1894-1937, 1965 (majority within 1913-1918)1
- Brownell family papers, 1823-1969 (majority within 1850-1940)1
- Calvin O. Davis papers, 1910-19411
- Calvin Thomas Papers, 1838-1940 (majority within 1872-1919)1
- Campbell family papers, 1860-1865, 1879-19491
- Carl M. Weideman Papers, 1921-1972 (majority within 1932-1934)1
- Carl Rominger family papers, 1840-19451
- Carlisle Family papers, 1860-19721
- Carlton F. Wells papers, 1910-19941
- Cavanagh Family papers, 1857-20061
- Charles A. Sink Papers, 1900-19961
- Charles Everett Adams diaries, 1874-19401
- Charles L. Stevenson papers, 1841-1846, 1925-19791
- Chase S. Osborn Papers, circa 1870-1949 (majority within 1889-1949)1
- Chester M. Howell papers, circa 1910-1990 (majority within 1950-1980)1
- Chris H. Jorgensen notebook, 1891-19591
- Christina V. Pacosz papers, 1899-2019 (majority within 1961-2012)1
- Clara H. Brucker papers, 1920-19801
- David Nash collection, 1928-20081
- David Wheeler Palmer and family papers, 1807-19821