Collection
- Boardman papers, 1785-19421
- Book Collectors collection, 1769-19501
- Booker T. Washington collection, 1897-19151
- Brasee-Scofield family papers, 1819-1950 (majority within 1819-1874)1
- Brotherhood Railway Carmen of America, Excelsior Lodge 184 collection, 1902-1937 (majority within 1902-1930)1
- Brownell family papers, 1823-1969 (majority within 1850-1940)1
- Burton family collection, 1888-19401
- Carrie M. Stewart and Arthur K. Kepner collection, 1870-1908 (majority within 1898-1906)1
- Caspar F. Goodrich papers, 1869-19251
- Charles Brewster Ross collection, 1874-19321
- Charles Cogswell papers, 1869-1921 (majority within 1869-1899)1
- Charles Deane collection, 1840-1909 (majority within 1848-1889)1
- Charles F. Tew papers, 1837-19051
- Charles H. Foster collection, 1898-19671
- Charles Joseph Dyer papers, 1888-19371
- Charlotte Pettibone Winslow papers, 1834-1910 (majority within 1834-1851)1
- Chesnut-Ewalt papers, 1834-1913 (majority within 1862-1913)1
- Childe family papers, 1733-19081
- Christopher Hughes papers, 1801-1908 (majority within 1814-1884)1
- Christopher Van Deventer papers, 1799-19251