Collection
- Ashburnham (Mass.) petition and sworn statements, 18472
- B. Robert Winthrop letters, 1824-1829 (majority within 1824-1825)3
- B. Woodruff diary, 18842
- Barnum, Bailey & Hutchinson scrapbook, [circa late 19th century]2
- Bartolomé de las Casas Tyrannies et Cruautez des Espagnols Perpetrees es Indes Occidentales..., 15822
- Bateman & Switzer collection, 186--19122
- Bell Theatre scrapbook, [circa 1910s]2
- Benjamin Brown collection, 1817-2000 (majority within 1829-1844)7
- Bernard M. Baruch collection, 1920-194964
- Bernard N. Schlegel notebook, 1917-19182
- Blakely account book, 1785-17932
- Blooming Grove (N.Y.) Horse Thief Detective Society Board of Directors minute book, 1866-18832
- Bonnie Brae Farms Photograph Album, ca. 1900-19102
- Boston, Plymouth, and New Bedford Photograph Album, ca. 1888-19152
- Brearley-Pingree Collection, ca. 1860s-19492
- Breve Trattato di Geografia, [ca. 1650-1675]2
- Brill-Kelsoe correspondence, 1878-1889 (majority within 1885-1886)5
- Bristol (Me.) cobbler daybook, 1836-18442
- British Commissariat document trunk, [circa 1765]2
- Brookline, Massachusetts, Photograph Album, ca. 1895-19052