Collection
- Benajah Ticknor papers, 1818-18521
- Benjamin F. Graves papers, 1815-1950 (majority within 1848-1903)1
- Benjamin F. Ruggles journal, 1859-18611
- Benneville Hiester journal, 18531
- Berenice Bryant Lowe Papers, 1880s-1980s1
- Bert C. Whitney diary, 1918-19191
- Bertha Van Hoosen papers, 1880-19521
- Billings family collection, 1852-1918 (majority within 1879-1895)1
- Bird Family Papers, 1835-19141
- Bird family papers, 1821-1947 (majority within 1879-1941)1
- Birney-McClear-Hankerd family papers, 1835-19721
- Blanchard Family Papers, circa 1835-circa 20001
- Blanche Van Leuven Browne papers, 1898-1981 (majority within 1907-1930)1
- Boyd family papers, 1761-19451
- Brattle Street Church diary, 1772-17751
- Brayton W. Smith diary, 18671
- Brecken Family papers, 1894-1937, 1965 (majority within 1913-1918)1
- Brownell family papers, 1823-1969 (majority within 1850-1940)1
- Buchanan family papers, 1847-19271
- Buck Family papers, 1851-19281