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, manuscripts, documents, photographs, and memorabilia of Helen May MacLachlan. There are 570 letters from John Masefield and his wife to James Alexander MacLachlan, his wife Mary, and their children Howard James and Helen, 1916-1966, autograph poetry manuscripts, drawings, clippings, and 43 books presented by Masefield to Helen MacLachlan. Also, correspondence about the Theodore Roosevelt Association from Horace Marden Albright, Ethel Roosevelt Derby, Hermann Hagedorn, and others as well as correspondence from personal friends; and photographs of the MacLachlan family and friends.

Correspondence, documents and manuscripts from late seventeenth and eighteenth century France, especially from the French Revolution, collected by Sam Schaefler. Authors include J.B. Colbert Torcy and the Duchesse Du Lude. Many of the items from the French Revolution represent the work of the Committee of Public Safety and the Committee of General Security. French Revolutionary leaders represented in the collection include François-Antoine Boissy D'Anglas, Jean-Baptiste-Noel Bouchotte, Pierre Joseph Cambon, Lazare Carnot, Jean-Marie Collot D'Herbois, l'Abbʹe de Fauchet, Philippe-Antoine Merlin de Douai, Jean Victor Moreau. C.A. Prieur-Duvernois, and Antoine Joseph Santerre. In addition, the collection includes a letter from the Danish physicist Hans Christian Oersted to Sir John Herschel, a letter by the French poet Romain Rolland, a document of the Philadelphia Artists' Fund Society of 1846 with signatures of its officers, and an autograph letter and a photograph of Henry Wadsworth Longfellow.