The McCaddon Collection of the Barnum and Bailey Circus consists of correspondence, photographs, scrapbooks, and other material collected by business manager Joseph T. McCaddon prior to the 1907 merger of the circus with Ringling Bros.

Consists of over 2,000 autograph items of prominent English and European figures from the 16th to the mid-19th centuries compiled by the English collector John Wild.

Consists of a chronological series of 101 mathematical notebooks (1958-1997) of Princeton mathematician Bernard M. Dwork.

Consists of Hanna Fantova's collection of Albert Einstein material, as well as some of her own personal papers.

Alpheus T. Mason taught in the Dept. of Politics at Princeton University beginning in 1925 and authored a number of legal works as well as biographies of Supreme Court justices Harlan Fiske Stone and Louis D. Brandeis. This collection consists of papers of Mason, including material relating Stone, Brandeis and Woodrow Wilson.

John Foster Dulles (1888-1959), the fifty-third Secretary of State of the United States for President Dwight D. Eisenhower, had a long and distinguished public career with significant impact upon the formulation of United States foreign policies. He was especially involved with efforts to establish world peace after World War I, the role of the United States in world governance, and Cold War relations between the United States and the Soviet Union. The Dulles papers document his entire public career and his influence on the formation of United States foreign policy, especially for the period when he was Secretary of State, and include his correspondence files, as well as his writings, reports, and memorabilia.

Jacob Viner (1892-1970) is considered one of the greatest economists of the twentieth century. His career was spent at the University of Chicago and Princeton University, and he also frequently served as an advisor to the United States government. His primary academic interests included international economics, international economic relations, and the history of economic thought, but his investigations ranged across many disciplines. Viner's papers document his scholarship, as well as his government service, and include correspondence, manuscripts, reports, and research materials.

The American Civil Liberties Union Records document the activities of the Union in protecting individual rights from 1920 through 1995. The files contain materials on freedom of speech, expression, and association; due process of law; equality before the law; legal case files; and organizational records. Within these categories files reflect subject areas such as academic freedom, censorship, racial discrimination, aliens' rights, privacy concerns, labor concerns, amnesty, and government loyalty and security. The files reflect work on litigation, advocacy and public policy, and subject files on various areas of interest connected with civil liberties. Materials include correspondence, court documents, memoranda, printed matter, minutes, reports, briefs, and legal files. Also included are materials from ACLU affiliate organizations, and the Lawyers Constitutional Defense Committee.

Marten Van Heuven (1932- ) led a career in the United States foreign service, serving in several European countries, which culminated with his service as National Intelligence Officer for Europe from 1987 to 1991, a position responsible for the analysis of European and Canadian issues. Van Heuven's papers document his career in the United States foreign service and at RAND, and include his speech files, writings files, and correspondence.

Harold Boies Hoskins was a businessman, diplomat, and educator working in Middle Eastern affairs. This collection consists of correspondence, diaries, notes, photographs, publications, maps, and professional files that document Hoskins' personal and professional activities, as well as the Hoskins family.

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.

Prentice Northup Dean (1897-1981) was a practicing economist for the United States Tariff Commission and the Office of the Secretary of Defense. He also held teaching positions at Princeton University, the University of Pittsburgh, and Buena Vista University. Dean's papers document his service as United States delegate to the meetings of the General Agreement on Tariffs and Trade (GATT) and his years studying at the American University in Beirut, and include correspondence, diaries, documentation of conferences, memorabilia, and newspaper clippings. The papers also include the correspondence, diaries, and manuscripts of his family members May Dershimer née Walter and Martin R. Walter.

Peter Grose is an editor and specialist on the history of intelligence. The Peter Grose Papers document Grose's research on Allen Dulles, the origins and early years of the Central Intelligence Agency, and the Soviet Union.

David F. Bradford (1939-2005) was a professor of economics and public affairs at Princeton University and served on the faculty from 1966 to 2005. His main areas of study were public finance and urban problems, and he was internationally known as an expert on taxation. Bradford's papers document his academic career and include correspondence files and conference files, as well as papers related to his research with Harry H. Kelejian, his appointment books, and biographical materials from his years as a student.

The Records of United Service to China, Inc., known from 1941 to 1946 as United China Relief, Inc., document the activities of the organization from the early formation in 1940 to its official consolidation with the American Bureau for Medical Aid to China in 1966. In addition there is a limited amount of material from other Chinese relief agencies that predate the founding of United China Relief / United Service to China. The Records focus on UCR/USC attempts to raise money in the United States, to educate Americans about China and the Chinese people, and to carry on relief work in China. The collection consists primarily of correspondence among the various individuals and agencies involved with UCR/USC, along with other material produced by the agency, such as minutes and publicity material. In addition, the collection includes a series of photographs dealing with China during the 1940s and efforts in the United States to raise money for China during the same period.

Walter E. Spahr (1891-1970) was a professor of economics at New York University who was a strong supporter of the gold standard. Spahr was a founding member and officer of the Economists' National Committee for Monetary Policy, which advocated for sound monetary policies for the United States. Spahr's papers document his scholarship and include his writings and related correspondence.

Frank Thompson was a New Jersey politician. He was elected congressman from the Fourth Congressional District of New Jersey in 1955 and was assigned to the Education, Labor, and Administration committees. The papers in this collection reflect his special interests in federal aid to education and the arts.

The papers of John J.B. Shea document his activities as executive chairman of the 1956 Stevenson for President Committee (New York State). The committee was comprised of Democrats, Republicans, Liberals, and Independents devoted to promoting Stevenson's candidacy and election to the office of President of the United States. The New York committee organized local Stevenson for President Committees throughout New York State, and provided guidance and overall supervision to these local groups.

Consists of selected papers of Thompson, including 27 scrapbooks of clippings (1884-1941) of his columns and articles written while he was a Washington correspondent, book reviewer, and editor of the New York Times (1899-1921) and, later, a writer in Philadelphia for the Public Ledger (1921-1922) and Commonweal (1930-1931).

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.