The Thomas Jefferson Papers Project was conceived of in 1943 by Princeton University history professor Julian P. Boyd, who was serving at the time as the historian of the Thomas Jefferson Bicentennial Commission. Contained in the records is correspondence with Princeton presidents Harold T. Dodds and Robert F. Goheen, who were active advisors in the early years of the project. Also included are financial records, including Boyd's original cost estimations for the project. Other materials consist of an initial project proposal, annual reports, directives on handling of materials, typography, and editing procedures, and some photographs.

The Princeton Tiger is the nation's second oldest college humor magazine. The collection consists of the administrative records of The Princeton Tiger.

Consists of letters by American novelist Benedict Thielen (Princeton Class of 1923) to Frederic Roderigo Gruger, Jr.

Consists of selected papers of George F. Thomas, professor of religious thought (1940-1968) at Princeton.

The Lewis Thomas papers consist primarily of files from the years (1973-1983) that Thomas (Princeton Class of 1933) spent as president and, later, chancellor, of Memorial Sloan-Kettering Cancer Center in New York City. These contain general correspondence with doctors, drafts and reprints of his essays and books, files of lectures, presentations, and awards, and files of scientific organizations with which he was involved. There are also drafts and reprints of early scientific papers (which pre-date his years at MSKCC).

Consists of manuscripts, correspondence, documents, photographs, scrapbooks, and miscellaneous research material of librarian/archivist Milton Halsey Thomas, including research material for several of his historical publications.

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.

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

Consists of works, correspondence, diaries, documents, photographs, maps, scrapbooks, miscellaneous material, and printed matter by and about mountaineer J. Monroe Thorington (Princeton Class of 1915), as well as some papers of other people.

Contains selected papers, photographs, and memorabilia of Arthur H. Thornhill, Jr., Princeton Class of 1946, pertaining to his publishing career at Little, Brown and Company and his involvement in a variety of organizations and activities within the publishing industry. Also present in the collection is a limited amount of material from Thornhill's father, Arthur H. Thornhill, Sr., who preceded his son as president of Little, Brown and Company.

Consists of material which reflects the long careers of American educators, authors, and literary critics Willard and Margaret Thorp. Willard's papers (1923-1981) include correspondence, writings, class lecture notes, documents, journals and diaries, printed matter, photographs, and papers of others during his writing and teaching years at Princeton University. Margaret's papers (1917-1960) include writings, correspondence, journals, notebooks, and family sketchbooks and photographs.

Consists of selected letters and photographs of authors, poets, and friends collected by Alice Davis Tibbetts, secretary, companion, and romantic partner of Edgar Lee Masters.

Conists of personal papers of William Tipping Esq, of Brasted Park, Sevenoaks, in Kent, and Avray near Paris. He was the son of the successful Liverpool merchant John Tipping, who in his twenties traveled extensively in Europe and the Middle East before turning to Tory politics and serving as director of the London and North Western Railway.

Consists mainly of correspondence and manuscripts of Tobey (Princeton Class of 1940) from the period (1955-1976) when he was a member of the staff of the Turkish Ministry of Education in Samsun, Turkey, teaching English.

Consists of manuscripts of Calvin Tomkins (Princeton Class of 1947) for his first novel, Intermission (1951).

Ridgely Torrence was an American poet, playwright, and editor of The New Republic, and his papers document the literary activity and relationship of a large group of American writers between the years 1890 and 1950. Particularly well-represented are American poets William Vaughn Moody and Edwin Arlington Robinson.

Consists of approximately 100 letters and postcards addressed to Trigueiros from seven correspondents: Jorge Amado (1967-1995), António S. Celestino (1973), Manuel Ferriera (1959-1966), Jesué Pinharanda Gomes (1960-1995), António Guedes de Amorim (1947-1971), Afonso Lopes Vieira (1935-1944), and José Rodrigues Júnior (1958-1987).