Collection
- Louis Miano Theater Collection, 1896-20171
- Love-Scarborough Papers, 1835-1936, Date acquired: 05/25/19591
- Loy Glenn Westfall Cigar Industry Research collection, 1860-1982, Date acquired: 00/00/20151
- Lue Gim Gong collection, 1886-1935, Acquired1
- Lula Elnora Alice Hamilton DeGraff Papers, 1907-19241
- 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
- Manuscripts – Single Items Collection, 1818-19711
- Marion Hay Collection, 1891-19801
- Marion Rinhart Photographs Collection, 1860-1952, bulk 1875-19341
- Marshall Family Collection, 1902-19421
- Marti Colon cemetery collection, 1887-2000, Date acquired: 12/01/2012, bulk 1887-19901
- 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 -- Puck Magazines, The majority of the material is from the 1880s and 1890s and deals largely with social and political issues of the time., bulk 1878-19161
- 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 -- Miscellaneous, 1755-19901