Alfred J. Lotka (1880-1949), a statistician for the Metropolitan Life Insurance Company, was a significant contributor to the field of demography. He was a pioneer in the study of population dynamics and conducted research on the mathematical theory of evolution and the mathematical analysis of populations. Lotka's papers document his scholarship and his involvement in professional organizations and include drafts of his works, his notes and research materials, and correspondence.

Consists chiefly of letters by Alfred Thayer Mahan to his publisher regarding his writings about United States naval history. Mahan was a U.S. naval officer in the Civil War, and his work on the importance of adequate navies and merchant marines influenced the policies and philosophies of national leaders across the globe, including those of the 26th president of the United States, Theodore Roosevelt.

Consists primarily of correspondence and printed material, along with two diaries from 1926, a matted postcard, a photogravure plate, and a piece of hair jewelry. These family papers primarily center on Alice Holden (née Cort), as the correspondence are letters between members of the Cort family, or letters to her from her children. The collection largely documents the relationships of the Holden and Cort families in New York state between the 19th and 20th centuries.

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.

The Alice Raphael Collection of Faust Materials contains photographs and epherema relating to the Yale bicentennial of Goethe's Faust , for which Alice Raphael's translation was used, as well as information about other productions of Faust and about Raphael's other work.

Consists of papers and photographs of Alison Frantz (1903-1995), a classicist who was the photographer and specialist in Early Christian and Byzantine archaeology for the Agora excavations at Athens from 1933 to 1968 for the American School of Classical Studies.

Consists of the papers of Allan Marquand, Princeton art professor, founder of the University's Department of Art and Archaeology, and first director of its Art Museum.

Allen Macy Dulles, son of Clover Todd and Allen Welsh Dulles, was a student of history and politics with plans for a career in public service until he sustained a serious injury in the Korean War. The collection consists of correspondence between family members prior to and following Allen Macy Dulles' injury as a Marine lieutenant in the Korean War.

Consists primarily of letters and postcards to various friends, fellow poets, and associates by American poet and editor Allen Tate.

Consists of extensive manuscripts, documents, and correspondence of American poet and literary critic Allen Tate, one of the leading members of the Fugitive and Southern Agrarian literary movements.

The Allen W. Dulles Papers contains correspondence, speeches, writings, and photographs documenting the life of this lawyer, diplomat, businessman, and spy. One of the longest-serving directors of the Central Intelligence Agency (1953-1961), he also served in a key intelligence post in Bern, Switzerland during World War II, as well as on the Warren Commission.

Allen W. Dulles (1893-1969), though a diplomat and lawyer, was renowned for his role in shaping United States intelligence operations, including the longest service as director of the Central Intelligence Agency (CIA). The Allen W. Dulles Digital Files contain scanned images of professional correspondence, reports, lectures, and administrative papers, declassified and released by the CIA in 2007. The collection spans Dulles's time as Chief of the Office of Strategic Services office in Bern, Switzerland during World War II, his work at the Central Intelligence Agency, and his retirement.

The Allied Mission to Observe Greek Elections was established when on September 19, 1945 the Governments of Britain, France, and the United States accepted the Greek Government's invitation to send observers for the general elections and plebiscite to be held in 1946. The collection consists of correspondence, circulars, memos, press extracts, and and maps, including one annotated map depicting the locations of headquarters among the country.

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.

The Alonzo Church Papers consists of the writings, correspondence, notebooks, notes, and subject files of Alonzo Church (1903-1995, Princeton Class of 1924), the renowned mathematical logician who taught at Princeton University from 1929-1967 and the University of California at Los Angeles from 1967 to 1990, and who was editor of the Journal of Symbolic Logic from 1936 to 1979.

Consists of 50 diaries of Alonzo Gore Oakley, a manager of the New York City office of the United States Fidelity and Guaranty Company.

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.

This collection consists of offprints of articles written by Princeton alumni and faculty; however, in some instances the articles are written about an individual alumni or faculty member. The offprints generally consist of journals, published articles, speeches, lectures, sermons, memorials, and articles from scientific journals and magazines.

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 Alvaro Yunque Correspondence consists of letters, manuscripts of poems, essays and other printed and miscellaneous material by Alvaro Yunque and others.