This series includes some 10,000 letters, telegrams, postcards and other communications received by Russell and his immediate associates over the years 1897 to 1956. The letters are arranged alphabetically by correspondent and then chronologically for each correspondent, with corporate entries and cross reference cards as described for the outgoing correspondence. Russell's colleagues often sought his opinion of their work, and some 175 manuscripts are interspersed with the incoming letters. Folders of correspondence which contain one or more manuscripts are labeled on the right side "Manuscript enclosed with correspondence". At the same time, there is a 3 x 5 yellow card for each manuscript which lists its author, title, length, date, and location. The yellow cards are arranged alphabetically by author in a file stored in the manuscripts catalogue.

The Photographs and Audio-Visual Series consists of photographs, microfilm, and sound recordings gathered by the editorial staff of the Papers of Woodrow Wilson. The photographs provide a visual complement to the papers gathered in this collection, and many were published throughout the 69 volumes of Wilson papers. The microfilm consists of reels ordered from repositories throughout the country and around the world, containing correspondence to and from Wilson, as well as reports from his administration, diaries, newspapers, and papers of individuals related to Wilson. The audio contains recordings of radio programs and seminars on the topic of Wilson, as well as some of his speeches.

Consists of personal and family correspondence as well as business and legal correspondence.

Contains books shelved by Derrida in his Studio, an addition to the house that served as Derrida's principal work environment from the time it was built in 2001 up to his death in 2004. Books are represented here as inventoried in 2011. Also includes books not inventoried in 2011 (hence presumably not shelved in the Studio at the time) but located in the Studio at the time of packing the Library for shipment to Princeton University Library.

Contains books shelved by Derrida in his Studio, an addition to the house that served as Derrida's principal work environment from the time it was built in 2001 up to his death in 2004. Books are represented here as inventoried in 2011. Also includes books not inventoried in 2011 (hence presumably not shelved in the Studio at the time) but located in the Studio at the time of packing the Library for shipment to Princeton University Library.

Consists of manuscripts, both bound and unbound, mostly oversize, and artwork/ephemera housed in a variety of oversize containers.

This series documents the composition and activities of the alumni, the Alumni Council, and other alumni organizations. A large section at the beginning of this series documents the activities of the Alumni Council (the University-sponsored administrative arm of the Alumni Association), including Princeton reunions. Other topics include alumni organizations, occupations, regional associations, and long alphabetical runs on doubtful alumni (those individuals whose alumni status is in doubt) and alumni families (families who have sent more than one member to Princeton or who have been deeply involved in the University).

The University Librarian series contains the records of the various individuals who have held the position and provide an overview of the Library's historical development from the vantage point of one of the few roles that have remained relatively static throughout the Library's entire existence. As the chief administrator of the Library, the University Librarian is involved to some extent in nearly every aspect of the institution's planning and evolution. This is especially true in the earlier years of the Library when activities later undertaken by separate departments were somewhat more centralized around the Librarian. Such diversity of purpose is represented in the University Librarian records themselves, which primarily contain correspondence, subject files, and other documentation relating to topics as varied as collection development, finances, fundraising, organizational and staff matters, and university policy. Please see subseries descriptions for further information regarding the individual subseries.

Series 7: Secretaries of the University, is divided into several subseries, one for each individual to hold the office of secretary in order of their service.

The General series contains documents, clippings, and correspondence about each decade in Princeton's history from its founding until the present. The series consists of material that can neither be filed in any one other series nor in the chronologically arranged portion of the historical subject files. The files of Keeper of Princetoniana Frederic Fox, for example, include his notes on various aspects of Princeton life and history. Campus maps and general campus views can also be found here. Themed campus tours include views of Princeton in 1865, as well as tours focusing on trees and gargoyles.