The Princeton University Library is one of the foremost university libraries in the world. With collections totaling over 12 million volumes, manuscripts, and nonprint items spread across fifteen buildings, the Princeton University Library system serves not only the Princeton University community but the world at large. The Princeton University Library Records consist of the files of the University Librarian and other Library administrators and departments, as well as of the Friends of the Princeton University Library. Materials in the record group include correspondence, reports, publications, clippings, minutes, press releases, proposals, statistics, photographs and other audiovisual materials, and microfilm. The records document the Library's day-to-day operations as well as its involvement with other departments on campus, other college and university libraries, and library users.

Consists of selected correspondence and scientific papers of Martin Schwarzchild, a German-American astronomer and Princeton professor who pioneered the use of balloon-mounted instruments to study stellar structure and evolution.

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.

The Early Photographs of Greece Collection is an open collection for general photographs of sites and subjects in Greece. Included are panoramic photographs of the Parthenon, Athens, and Smyrna, along with other photographs of Greece.

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.

This collection consists of virtually all of the surviving records of Scribners (1846-1984), the New York City publisher, and reflect aspects of all of its publishing functions (soliciting and acquiring books, editing manuscripts, printing and manufacturing books, advertising and publicizing publications) and business concerns (book and magazine publisher, retail bookstore, subscription books department, educational books department, printing press and bindery, rare books department). Included are files of editorial correspondence with authors, manufacturing records about book production, advertising records, author contracts, a collection of dust jackets, book catalogs, ledgers, and photographs. While there are gaps in most of the series or record groups, there are records representative of all of the firm's former permutations: Baker & Scribner, Charles Scribner & Co., Scribner, Armstrong & Co., Scribner, Armstrong & Welford, Scribner & Co., Charles Scribner's Sons. The bulk of the material (1880s-1970s), however, dates from the period when the publisher bore its most familiar name, "Charles Scribner's Sons." There is also material related to early publishers' organizations and international copyright.

The Louis Fischer Papers include correspondence, interviews, articles and notes, lectures and speeches, photographs, and audiovisual materials that document his life as a journalist, writer, and commentator on international affairs. They also include the papers of his wife, Bertha Markoosha Fischer, an author in her own right, as well as family correspondence and papers. In the latter part of his life Fischer was affiliated with of the Institute for Advanced Study (1959-1961) and Princeton University's Woodrow Wilson School of Public and International Affairs (1961-1969).

This collection contains correspondence, speeches, lecture notes, writings, and photographs of Edward S. Corwin, a noted constitutional scholar who taught at Princeton University for much of his academic career. Nationally-known and widely published, Corwin consulted with many other academics as well as politicians involved with constitutional issues, most notably when he publicly supported Franklin D. Roosevelt's Supreme Court reorganization ("court packing") plan.

Consists of a photocopied duplicate archive of the original Albert Einstein Archive at Hebrew University in Jerusalem, divided into scientific and non-scientific sections, including published and unpublished manuscripts, articles, lectures, notebooks, notes, travel diaries (1925-1933), family papers, and correspondence.

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.