- Austin-Twyman Papers, 1765/19391
- B. Davenport & Co. Ledger, 1841/18611
- Baer Family Papers, 1744/19291
- Baird Family Papers, 1656/1922, bulk 1656/18481
- Bayles Family Papers, 1827/19451
- Beard Papers, 1834/19061
- Beauregard Furnace Journals, 1861/18651
- Benjamin F. Walker Account Books, 1857/18631
- Blacksville Store and Gristmill Business Records, 1850/19081
- Blow Family Papers, 1613/1960, bulk 1770/18751
- Booton-Modesitt Family Papers, 1809/1880, bulk 1820/18501
- Boswell Mercantile Ledger, 1855/18611
- Brick Company Ledger, 1857/18621
- Brooke County (W. Va.) Court Records and Miscellaneous Papers, 1780/19181
- Butcher Memorandum Book, 1850/18991