The Harold Nicolson Papers consists of papers of the English diplomat, journalist, and biographer Harold Nicolson (1886-1968). These papers primarily contain correspondence received by Nicolson, but there is also a large series of letters written by Nicolson to Richard Rumbold, as well as a few to others. Also included in the collection are manuscripts and/or working notes for four of Nicolson's published works. Furthermore, there is a small amount of papers of others, chiefly correspondence by and to Nicolson's wife, "Vita" (Victoria) Sackville-West.

Consists of a closed collection of more than 5,000 Western Americana photographs, consisting mostly of documentary photographs of the Trans-Mississippi West from the late 1860s to early 1900s, largely from the perspective of white photographers and settlers. Subjects include American Indians (especially studio portraits), natural wonders, cities, towns, buildings, and economic activities (mining, railroads, logging, and agriculture). Some photographs relate to the Indigenous populations of Mexico and Central America. The dimensions, physical formats, and photographic processes of the photographs vary widely.

Consists of the papers of Hungarian-born, Nobel Prize-winning physicist Eugene Wigner, and includes correspondence, subject files, writings, and offprints reflecting his long career in physics.

Bruce and Beatrice Blackmar Gould were co-editors at the Ladies' Home Journal in the mid 20th century. Bruce Gould also worked with the Saturday Evening Post. Their correspondence includes letters between Bruce and Beatrice about their co-editorship and co-authorship, letters with writers for the Ladies' Home Journal, and letters from actresses about the Ladies' Home Journal. Also included is a collection of letters about Marion Crawford's book The Little Princesses, some of Beatrice's speeches, speeches by others, and printed matter.

The Princeton Nassoons are a close-harmony, all male, student a cappella group that formed in the late 1930s. The collection consists primarily of the Princeton Nassoons' original musical arrangements and correspondence.

Charles W. Yost (1907-1981) led a varied career as a diplomat, United Nations representative, writer, and scholar. He was a member of the foreign service intermittently between 1930 and 1971, after which time he devoted himself full-time to writing and teaching. Yost's papers document his professional life in the Foreign Service, as well as his time in academia, and include his correspondence, writings, and photographs.

The organization that became Americans United for Separation of Church and State was founded in 1947 to protect church-state separation and religious freedom, as well as to educate lawmakers, religious leaders, and the general public regarding Constitutional religious liberties. The records document the administration and issues of the organization from its founding and include correspondence, meeting materials, and publications.

The Selected Papers of Harper & Brothers consist primarily of the editorial and business correspondence of Harper & Brothers, a distinguished publishing firm, between 1909 and 1960.

Jeffrey Fuller (1917-1970) worked for the American Civil Liberties Union (ACLU) from 1948 to 1966 and also served in the U.S. Army during World War II. Fuller's papers document his service in the U.S. military and his work for the ACLU and include his personal and professional correspondence, memoranda, and diaries.

Consists of files created by P.E.N. American Center as part of its regular business operations since its founding in 1922. Includes material on governance and policies, programs, awards, and financial aid granted to authors, and the center's involvement with International P.E.N. and other P.E.N. organizations worldwide. The collection is especially notable for its extensive author correspondence and occasional original manuscripts, as well as audio and video recordings of P.E.N. programs and events.

Consists of works, correspondence, documents, notes, photographs, and printed matter of Julian Boyd, Princeton University Librarian (1940-1952) and professor of history, and the founding editor of the Papers of Thomas Jefferson publishing project.

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.

The collection consists mainly of playbills, photographs, and clippings of press announcements and reviews of the University Players, a youthful group of Princetonians aspiring toward careers in the performing arts. Not entirely comprised of Princeton alumni and undergraduates, however, the organization provided experience and training for many hopefuls who have in fact succeeded in that goal. Taking its name from an earlier group with the same ambitions and who also made great contributions to American theatre and film, it provided the Princeton community with some exciting and meritorious summer theatre for more than a decade.

Tristan E. Beplat (1912-1997) was a New York banking executive with expertise in international banking. He had a significant role in the economic reconstruction of postwar Japan through his work in the Finance Division of the Economic and Scientific Section, General Headquarters, Supreme Commander for the Allied Powers. Beplat's papers document his service in Japan and include memoranda, papers, and reports on the banks and economy of Japan from 1945 to 1948.

Karl S. Twitchell was an American mining engineer who conducted extensive surveys in the Middle East, Europe, and South America between 1915 and the 1950s. His papers document the span of his career, particularly his interest in the Middle East, and include correspondence, journals, notes, reports, writings, topical files, photographs, and maps. Personal documents and correspondence with family and associates are also contained.

This collection consists of papers of Antōnēs Dekavalles, a Greek poet, professor at Fairleigh Dickenson University, and editor of The Charioteer, A Review of Modern Greek Culture. Included are: correspondence, autograph manuscripts and typescripts, drafts, miscellaneous notes, and files related to his affiliated organizations.

This collection documents the life and activities of Sylvia Beach (1887-1962), the American author, publisher, and owner of the Paris bookshop Shakespeare & Company, the Paris bookshop that was a meeting-point for French, English, Irish and American writers during the 1920's and 1930's. The collection consists largely of files relating to Shakespeare & Company; Beach's writings and translations, in particular her memoir Shakespeare & Company ; and files relating to the circle of artists and writers surrounding her throughout her life. Included are family, personal, and business correspondence; business records of Shakespeare & Company; personal and family records; manuscripts and artwork by members of her circle; photographs; and memorabilia.

Max Gordon (1892-1978) was an American theatrical producer. His collection contains personal correspondence with theater and film notables spanning the years 1942-1971. Also included are production materials, such as correspondence, contracts, summaries of earnings, financial sheets, and miscellaneous notes of plays Gordon produced, including Born Yesterday, The Solid Gold Cadillac, My Sister Eileen, and the film, Abe Lincoln in Illinois, as well as letters and script reports relating to Columbia Pictures.

The H. H. Hess Papers consists of professional papers, correspondence, and related materials of the American geologist and educator Harry Hammond Hess (1906-1969).

consists of scrapbooks of publicity photographs of American motion-picture actors and actresses, mainly of the 1930s and 1940s, collected by Mrs. A. M. Yeandle.