The Class Records consist of a diverse set of materials documenting the history and activities of Princeton University classes during their time as undergraduates and as alumni. In the collection are correspondence, newsletters, publications, photographs, and memorabilia, all of which pertain to a particular Princeton University graduating class and its members.

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.

The papers of William A. Eddy (1896-1962), educator, diplomat, minister to Saudi Arabia, intelligence agent, and college president, focus on his presidency of Hobart College (1936-1941), his work in U.S. - Middle East policy, and his family life in the period from 1917-1962. The holdings of his personal and family correspondence is extensive. The collection contains all correspondence from his term as president of Hobart College, 1936-1941. Many military documents are included, especially in the years 1941-1946 (the planning of the North African landings, the FDR/Ibn Saud meeting, the Treaty of the Yemen). There are many geneological papers and letters from Eddy's relatives concerning American missionary work in the Middle East. There are numerous publications concerning 18th C. English literature, religious and civic duties, U.S. Foreign policy re Israel and the Arabs, and sociological accounts of the Middle East. The collection is composed of personal/professional correspondence, documents, diaries and notebooks, addresses, publications, manuscripts of Eddy's books and articles (including unpublished MSs), scrapbooks, photographs, negatives, and memorabilia.

The Princeton University Library Collection of Historical Subject Files, Grounds and Buildings contains information relating to the buildings, grounds, and architects of Princeton University. The collection also includes information on the development of the campus and the various chronologies of construction and land acquisition that have been gathered.

George F. Kennan (1904-2005) was a diplomat and a historian, noted especially for his influence on United States policy towards the Soviet Union during the Cold War and for his scholarly expertise in the areas of Russian history and foreign policy. Kennan's papers document his career as a scholar at the Institute for Advanced Study and his time in the Foreign Service, and include his correspondence files, published and unpublished writings, and personal files.

The Office of the Registrar is the administrative office of Princeton University responsible for the collection and maintenance of the academic records of the student body, as well as the establishment of course and examination schedules and the collection of fees related to matriculation and registration. The records contain the academic records of individual students, subject files on topics related to admissions and matriculation, statistical reports, and other official documents issued by the Office of the Registrar.

The Department of Chemistry at Princeton University dates back to the early days of the College of New Jersey, and today it is one of the University's largest undergraduate concentrations. The collection contains examinations and grade books, records pertaining to chemistry research performed at the department in support of the U.S. Manhattan project and departmental records.

The Alejandro Rossi Papers consist of personal notebooks, manuscripts, correspondence with writers, academics, editors and artists, and printed material of the writer.

William Jovanovich (1920-2001) was an American publisher, author, and businessman, who led the publishing firm Harcourt Brace Jovanovich from 1954 to 1991, as president and later as chief executive officer. The collection consists of Jovanovich's author and publisher files, including an extensive file on Charles A. Lindbergh, along with correspondence, writings, personal and family papers, memorabilia, and other files documenting his career as a major American publisher in the 20th century, his creative pursuits in fiction and nonfiction, and his interest in Yugoslav literature and textbook publishing.

Arthur Cyrus Warner (1918-2007) was an activist in the gay liberation movement, focusing his efforts on legal reform to protect the civil liberties of the gay community. Warner's papers document his involvement in legal reform and other issues pertaining to gay rights. The papers largely consist of legislative and court documents about cases affecting gay civil liberties, and related memoranda, correspondence, and writings.

The Allison Delarue Collection consists of a draft of Delarue's unpublished autobiography, letters received by Delarue from various friends, associates, and people involved in dance and the theater, and prints, photographs, and objects collected by Delarue relating to ballet and its history.

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 Syllabi and Course Materials Collection brings together original materials from the university archives that document the content of classes taught at Princeton University.

The Alumni Association of Nassau Hall, Princeton's first official organization of alumni, was founded on commencement day 1826. The collection consists primarily of administrative materials such as correspondence, meeting minutes, notebooks and reports belonging to both national and regional associations and their committees, most from the first half of the 20th century. Also contains newsletters, alumni directories, scrapbooks, reunion-related ephemera, photographs, and materials documenting reunions and alumni organization activities from the late 19th century forward.

The Carlos Fuentes Papers consists of personal and working papers of Fuentes (1928-2012), Mexican author, editor, and diplomat, including notebooks, manuscripts of novels and novellas, short stories, plays, screenplays, nonfiction writings, speeches and interviews, translations of fiction and nonfiction, correspondence, juvenilia, drawings, documents, photographs, audiocassettes, videocassettes, papers of others, scrapbooks, clippings, and printed material.

The course examinations collection consists of examination questions administered to applicants, undergraduates, and graduate students at Princeton University.

The Princeton Scientific Expeditions Collection brings together original materials from the university archives that document the work of various scientific expeditions conducted under the aegis of Princeton University and its corporate predecessors. The connection with the university ranges from enterprises duly authorized in the trustees' minutes to expeditionary tasks that happen to have been carried out by members of the university faculty, often with little official notice of Princeton as an institution.

Princeton University's School of Engineering and Applied Science is an academic unit which since 1921 has overseen the curriculum and administration of the University's academic departments in the engineering sciences. The records document the activities of the School of Engineering and its subordinate departments and programs from its origins in the late 19th century until the present, and consist of correspondence, subject files, research reports, photographs, and other audiovisual materials.

This collection contains images used or considered for use by the publication the Princeton Alumni Weekly. The photographs are generally black-white glossy 8x10 prints; however, 5x7 prints are also found within the collection. The photographs are arranged in general topics, and then alphabetically within each subject. New accruals are added on to the end of the collection and maintained in the order in which they were transferred.

The papers of the Astrophysical Sciences Department represent the original observation records, correspondence, and teaching documents of Princeton astrophysicists from 1835 to 1990.