Consists of documents and correspondence of Smith Thompson (Princeton Class of 1788) covering, for the most part, the years (1823-1843) when he served on the U.S. Supreme Court.

Contains manuscripts, correspondence, documents, and photographs concerning the Throop and Throop Martin families of New Jersey. In addition to the family correspondence, there is an autograph collection and other miscellaneous items.

The Butler Family Papers consists of works, notes, correspondence, journals, photographs, and other materials of Benjamin Franklin Butler (1795-1858), William Allen Butler (1825-1902), Mary Russell Marshall Butler (1827-1919), Charles Henry Butler (1859-1940), Harriet Allen Butler (1861-1914), and other members of the Butler family.

Mary Mapes Dodge was an author and editor of St. Nicholas magazine. This collection contains manuscripts, correspondence, financial records, and photographs of Mary Mapes Dodge, as well as an unfinished biography of her by Spencer Mapes.

Consists of correspondence, manuscripts, and documents of members of the Joline family of Princeton, New Jersey.

The Alejandro Rossi Papers consist of personal notebooks, manuscripts, correspondence with writers, academics, editors and artists, and printed material of the writer.

Consists of the working papers used by Charles Coulston Gillispie while researching his book The Montgolfier Brothers and the Invention of Aviation, 1783-1784 (1983).

The collection documents the career of Richard Rush (Princeton Class of 1797) as lawyer, statesman, and diplomat, emphasizing diplomatic negotiations between the United States and Great Britain while he was minister to Great Britain (1817-1825) and between the United States and France when he was minister to France (1847-1849), as well as his successful efforts (1836-1838) in securing the Smithsonian bequest, which was used to establish the Smithsonian Institution. The papers of Richard Rush constitute the larger part of the collection; letters of his father, Benjamin Rush, M.D. (Princeton Class of 1760), and papers of his son, Benjamin Rush (Princeton Class of 1829, constitute the other major groups of papers in this family archive.

Consists of poetry manuscripts, documents, pictorial works, correspondence, and miscellanea relating to the English poet William Cowper (1731-1800), and to his circle of family, friends, and editors, collected by Neilson Campbell Hannay.

Consists chiefly of letters of the Constitution signer and Philadelphia lawyer Jared Ingersoll to his son Charles while he was a student at the College of New Jersey (now Princeton University).