The Research Materials series contains materials collected by Hirschman as he conducted his research. The majority of the series is composed of photocopies and offprints of articles and reports, as well as some newspaper clippings, about Argentina, Brazil, Chile, Colombia, Mexico, and Latin America in general. These papers cover a range of economic, social, and political issues, providing views of the conditions in each country and the region. The series also includes articles about political theories, philosophies, and world economic and political history, and Hirschman's notes from his travels to Latin America.

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.