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).

Consists (primarily) of manuscripts of works by Handel and his contemporaries but also of correspondence and subject files gathered by James S. Hall, the English surgeon who collected most of the manuscripts.

Consists primarily of family correspondence of John Henry Hobart, a bishop of the Protestant Episcopal Church.

Consists of letters and miscellanea of the educator, merchant, and first secretary of the Continental Congress Charles Thomson (1729-1824).

Consists mainly of professional and personal correspondence, some documents, and printed matter of Joseph Miller, a nineteenth-century English civil engineer primarily concerned with the construction of steam engines and other machinery for naval vessels.