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.

The correspondence, research, and teaching files of French-American cultural historian and Columbia University professor emeritus Jacques Barzun (1907-2012).

Correspondence and manuscripts of Van Doren, consisting of letters, poems, short stories, novels, plays, radio broadcast transcripts ("Invitation to Learning"), diaries, critical works, proofs, and printed works. Correspondents include Louise Bogan, Philip Booth, Babette Deutsch, Richard Eberhart, T.S. Eliot, John Gould Fletcher, Herbert Gorman, E.W. Howe, Robinson Jeffers, Archibald MacLeish, Louis MacNeice, Edgar Lee Masters, Lewis Mumford, Hyam Plutzik, Allen Tate, and Louis Zukovsky. Also, extensive correspondence with Robert Lax and Thomas Merton, as well as manuscripts by these two authors.