Correspondence, manuscripts, lectures, notes, diaries, notebooks, reports, financial records, blueprints, photographs, and printed materials of Y.C. James Yen and the IIRR concerned with the development, sharing, and financing innovative methods of teaching, improving agriculture, health and family planning, and education in impoverished villages. Among the cataloged correspondents are: Pearl Buck, William O. Douglas, Nelson Rockefeller, and DeWitt Clinton.

Correspondence, minutes, reports, documents, scrapbooks, publications, memorabilia, and photographs. The general files, minutes, and reports reflect the varied activities and interests of the League, including apportionment, court reform, education, and voting rights. The historical files contain photographs, printed materials, and memorabilia, filed chronologically. Also included are the periodicals and publications of the League, scrapbooks arranged chronologically, and "Mailbooks", or volumes of mimeographed reports and announcements which were sent to branches and board members. Among the major correspondentrs are: Thomas E. Dewey, Herbert H. Hehman, Nelson A. Rockefeller, Franklin D. Roosevelt, and Alfred Smith