Collection
- Lewis S. Moore Collection, 1862-19311
- Lois Deicke Rare Tropical Fruits and Vegetables Book Collection, 1811-19841
- Louise Richardson family letters, 1846-18781
- Love-Scarborough Papers, 1835-1936, Date acquired: 05/25/19591
- Loy Glenn Westfall Cigar Industry Research collection, 1860-1982, Date acquired: 00/00/20151
- MacGowan Gift, 1825-1959, Date acquired: 01/01/1968, bulk 1825, 1831, 1928, 19591
- Mahan collection of American humor and cartoon art, 1813-2005, Date acquired: 00/00/2006, bulk 1928-19651
- Major James Lucius Cross Correspondence, 1861-1865, Date acquired: 00/00/1993, bulk 1861-18621
- Manuscripts – Single Items Collection, 1818-19711
- Marion Rinhart Photographs Collection, 1860-1952, bulk 1875-19341
- Marvin & Sybil Weiner Spirit of America Collection Pamphlets -- Speeches, 1746-19321
- Marvin Dunn Collection, bulk 1843-20091
- Marvin and Sybil Weiner Spirit of America Collection -- Manuscripts, 1663 - 1977, Date acquired: 11/00/20121
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Almanacs, 1761-19071
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Congressional, 1764-1953, bulk 1764-19531
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Essays & Reports, 1745-19831
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Foreign Language, 1565-19421
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Letters 1744-1904, 1744-19041
- Marvin and Sybil Weiner Spirit of America Collection Pamphlets -- Miscellaneous, 1755-19901
- Mary Elizabeth Thomas Civil War papers, 1861-18651