The Russell papers contain drafts and carbon copies of some 13,000 letters which Russell wrote over the years 1908 - 1950 (approx.). These letters are arranged alphabetically by correspondent and then chronologically for each correspondent. Correspondents include not only individuals, but businesses, scientific societies, schools and divisions of Princeton University. Letters to individuals filed under corporate entries may be located by consulting the file of white cards in the manuscripts catalogue. For example, looking in the cross-reference file under the name of R.A. Gregory, one finds a card which reads as follows:

Series 8: March 2006 Addition (1993-2005) contains materials related to AAIA sacred lands protection, repatriation, the Medicine Wheel Coalition, and scholarships, as well as association administrative business such as insurance and audit materials.

The Pendray and Company Series contains documents created during the daily functions of the Pendray and Company business. There are documents pertaining to both internal Pendray and Company business and documents related to external clients. Pendray and Company business material include financial information, annual reports, memoranda, and correspondence. Materials related to Pendray and Company clients include correspondence, annual reports, financial statements, pamphlets, and posters. Advertisements and publications prepared for Pendray and Company clients document the company's public relations plans and strategies. Documents created for and by clients such as the Guggenheim Foundation, Solvay, Allied Chemical and Dye Corporation, and Westinghouse are well-represented.

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.

Series 7: November 2005 Addition (1990-2005) contains executive office files, publications, photographs, conference and meetings records, donor information, and other miscellaneous material.