The Parker mss., 1264-1871, consist of commonplace books, legal records, account books, volumes on heraldry, rhetoric and logic, genealogy, sermons, political tracts, a diary, gazetteer and a jest book in verse.
The Palafox mss., 1639-1658, consist of documents and correspondence signed by and related to Juan de Palafox y Mendoza, a major figure of the Mexican Colonial era.
The Near Eastern mss., 700-1915, consist of a collection of individually acquired manuscripts pertaining to the region formerly known as the Near East, now referred to as the Middle East.
The Mutis Daza mss., 1568-1936, except for a small portion, were assembled by Eduardo Posada, 1862- , historian and bibliographer, for Camilo Mutis Daza. Included are a number of outstanding items on Bolivia, Colombia, Ecuador, Peru and Venezuela during the wars of independence.
The Montreal Superior Court mss., 1718-1739, are certified typescripts of documents no. 9068-9085, 9470-9488, 9763-9777, 11333-11346, 11885-11894, 11900-11916, 1238-12244, 14112- 14133, 15229, 15314-15328, and 15330-15341 registered in the Montreal Court superieure and preserved in the Archives judiciaires du district de Montreal.
The Meigs mss., 1794–1831, cpnsists of letters and papers of Return Jonathan Meigs, 1764–1825, governor of Ohio, United States senator, and postmaster general during the administrations of Presidents James Madison and James Monroe.
The Medieval and Renaissance mss., 700-1600, consists of individual items acquired from time to time either as a gift or purchased from a variety of sources.
The McCulloch mss., 1766-1914, consist of letters and papers of Hugh McCulloch, 1808-1895, U.S. Comptroller of the Currency, Secretary of the Treasury, and a partner in the London banking house of Jay Cooke, McCulloch & Company.
The Mayhew mss., 1775-1782, consists of letters written to Betsy (also called Elizabeth or Eliza) Mayhew by Mary or Polly, sometimes referred to as Mary Palmer, 1746-1791.
The Lindley Family mss., 1670-1874, consist of photographs, letters, diaries, records, and genealogical material of Charles W. Lindley and the Lindley family.
The Lindenbaum, Peter mss., ca. 1590-2008, consist of the papers of Dr. Peter Lindenbaum (1938-2010), a former English Professor at Indiana University.
The Lincoln mss., ca. 1798-1959, consist of letters, documents, and facsimile copies of documents by and about Abraham Lincoln, 1809-1865, his ancestors, immediate family, members of his cabinet, and other persons closely connected with him.