Collection
- Latin America collection, 1518-1883 (majority within [18th-19th century])1
- Le Maire family papers, 1759-1875 (majority within 1771-1854)1
- Levi Wade collection, 1866-19021
- Litchfield-French papers, 1862-1918 (majority within 1862-1899)1
- Lucius Lyon papers, 1770-1934 (majority within 1833-1851)1
- Mackay and Vansittart family collection, 1838-1891 (majority within 1862-1891)1
- Marcus Ahlenfeld papers, 1825-18761
- McLean papers, 1861-19131
- Michael Day collection, 1803-1877 (majority within 1846-1860)1
- Michigan collection, 1759-19591
- Moody Kent collection, 1771-1912 (majority within 1798-1860)1
- Neil family papers, 1774-18721
- New York (N.Y.) Elevated Railway collection, 1866-18721
- Nixon family papers, 1800-1889 (majority within 1800-1851)1
- Oliver Hazard Perry papers, 1796-1969 (majority within 1812-1819)1
- Penn-Gaskell family collection, 1762-18801
- Petit family land documents, 1840-19021
- Philadelphia (Pa.) Mayors collection, 1705-19761
- Philleo-Norton family papers, 1830-18721
- Phoenix family papers, 1776-1884 (majority within 1808-1814)1