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.

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

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

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

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.