Collection
- Lawrence-Bass family papers, 1725-1904 (majority within 1800-1862)1
- Leander Wetherell letters, 1847-18961
- Lee family papers, 1701-1936 (majority within 1728-1871)1
- Leopold Mayer family collection, 1864-1970 (majority within 1885-1909)1
- Letters, Documents, & Other Manuscripts, Duane Norman Diedrich collection, 1595-2007 (majority within 1719-1945)1
- Letters, Documents, & Sermons, Blandina Diedrich collection, 1652-1967 (majority within 1726-1886)1
- Lewis Cass papers, 1774-19241
- Lyman Trumbull family papers, 1799-1924 (majority within 1859-1890)1
- Manuscript Sheet Music collection, 1801-1923 (majority within 1850s-1890s)1
- Martha Leach Packard commonplace book, 1837-1894 (majority within 1853-1862)1
- McViccar-Antes collection, 1802-19161
- Moody Kent collection, 1771-1912 (majority within 1798-1860)1
- Moses A. Cleveland collection, 1864-1917 (majority within 1864-1892)1
- Myers-Mason-Bailey family papers, 1790-19191
- Nannie S. Newman papers, 1864-1980 (majority within 1880-1929)1
- Patten family papers, 1783-1907 (majority within 1805-1864)1
- Philena Kendall papers, 1820-1895 (majority within 1850s-1870s)1
- Revolutionary Cuba and Philippines collection, 1849-1925 (majority within 1895-1903)1
- Russell A. Alger family papers, 1842-1975 (majority within 1863-1865, 1888-1945)1
- Russell-McCabe autograph album, 1759-19201