Correspondence, manuscripts, photographs, and printed materials of Lamont. Letters from George Santayana (1863-1952), with Lamont and others, a few early manuscripts, interviews and other notes on Santayana, and general correspondence about him. A series of letters from John Dewey to Lamont, discussing his ideas on humanism and religion. Extensive correspondence with the family of John Masefield including approximately 100 letters from Judith Masefield to Lamont, primarily written shortly after the death in 1967 of her father the poet John Masefield, and dealing with his life and work. Also, a few of her own writings; a number of the letters are descriptive of historical England and her concern for contemporary events. Among the letters from other family members are fifteen from Lamont's nephew, Jack Masefield, and 53 from his cousin Sir Peter G. Masefield, 1970-1983, conveying news about Judith as well as interest in the publication of John Masefield's letters from the World War I years and their continuing appreciation of Lamont's work on Masefield. There is discussion on the publication of Masefield's letters to Corliss' mother, Florence Lamont, printed in 1979.

Correspondence relating to Erskine's various educational, musical and literary interests; manuscripts of his writings; lecture notes for college courses; souvenirs of his army service in World War I and his Columbia University professorship, and student papers from his own school and college days. Also, biographical file, scrapbooks, and articles.

Professional correspondence, diaries, unpublished articles, lecture notes, abstracts, and other manuscripts by Mitchell. Subjects include economic theory and its history, business cycles, money, national planing, anthropology and psychology, and published material by Mitchell and others.