Collection
- William Bosson family scrapbook and genealogical papers, 1789-2000 (majority within 1789-1899)233
- Humphry and Moses Marshall papers, 1721-1863221
- Kane family papers, 1798 -1887 (majority within 1851-1866)220
- William Tell Claude editorials, 1846-1849216
- Book Collectors collection, 1769-1950197
- Christian Ludwig Benzien manuscript, ca. 1811193
- David Hartley papers, 1783-1785180
- Henry A. S. Dearborn collection, 1801-1850 (majority within 1814-1850)178
- Episcopal Bishops collection, 1778-1911166
- Bloomfield-Pike letterbook, 1812-1813164
- Dauphin County, Pennsylvania, slave records, 1788-1825164
- Dalton family papers, 1693-1876 (majority within 1761-1769, 1777-1779)162
- Handy family papers, 1670s-1980s159
- Douglas MacArthur collection, 1885-1983 (majority within 1917-1919)157
- Native American collection, 1688-1921154
- Continental, Confederation, and United States Congress collection, 1751-1902 (majority within 1761-1862)153
- E. Augustus Garrison journal, 1861-1869153
- Ogden family papers, 1790s-1850s151
- Thomas J. Chew family papers, 1797-1875 (majority within 1802-1857)151
- John W. Croker papers, 1765-1860 (majority within 1765-1857)147