- Alexander Campbell (1788-1866) Papers, 1808/18141
- Barns Family Records, 1884/19901
- Brown Family Papers, Photographs and Maps, 1765/19591
- Charles E. Krebs (1870-1954) Papers, 1912/19391
- Fletcher Brock Papers, 1851/18531
- Genealogical Society of Southwestern Pennsylvania, Collector, Material regarding Monongalia County Unrecorded Wills, 1726/17811
- George Washington collection, 1654/17991
- Gideon D. Camden (1805-1891) Papers, 1784/19581
- Greene County, Pennsylvania, Genealogy Index, 1960/19801
- Historic map collection, 1675/19712
- Isaac & Josiah Williams Brick Company, Account Books, 1844/19901
- Isaac Meason, Iron Producer, Iron Industry Ledgers, 1801/18221
- Jim Comstock, Newspaper Editor and Collector, Papers, 1650/2003, bulk 1850/19951
- John H. D. McGill Diary, 18641
- John P. Clarke (1825-1900) Papers, 1851/19001