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.

Working files of the architectural historians Rudolf and Margot Wittkower, dealing with Baroque and Renaissance painting, sculpture, and architecture. Included are manuscripts, notes, drawings, annotated proofs of articles and books, and some correspondence related to his writings and lectures. The majority of the files document his teaching, research, and writing at the University of London, 1934-1955, and at Columbia University. There are also some manuscript notes from his early years in Italy and Germany. Series I has been divided into six parts: Artists, Subjects, Book Manuscripts, Proofs, Notes, and Printed Materials. Some of the major files are Bernini, Bramante, Carracci, Michelangelo, and Raphael (Artists); Baroque Painting, Patronage, Rome, St. Peter's, Slade Lectures on the history of art (Subjects); ART AND ARCHITECTURE IN ITALY, BORN UNDER SATURN, and MATTHEWS LECTURES: GOTHIC VS. CLASSIC (Book Manuscripts). In addition there are proofs of essays and reviews with manuscript corrections and emmendations, copies of several of his own published works with his manuscript corrections, and typescript insertions for new editions. The Notes consist of eight card file boxes with notes chiefly relating to the Baroque period and Bernini. Materials created by or related to Rudolf Wittkower's wife, the architect and interior designer Margot Holzmann Wittkower, can be found primarily in Series II, IV, V, and VI. Material created or maintained solely by Margot Wittkower is located in Series VI; however, material she shared with Rudolf Wittkower is located in Series II, IV, and V.

Correspondence, manuscripts, memorabilia, photographs, and printed materials. The correspondence consists of letters relating to the publication and review of Jäckh's books, articles, and book reviews and typescript copies of letters by Hans Jäckh. There are manuscripts for his articles, lectures and speeches as well as clipping files of book reviews and articles by and about Jäckh in the European and North American press. The bulk of the collection is written and printed in German and deals with the Balkans and the Near East before 1920, including the Balkan War of 1912-1914, and the Turkish Revolution. Of particular interest are manuscripts and articles describing his land travels between 1903 and 1913 with the German fleet and on hot air balloons. Other topics covered include the Hocjschule für Politik, German labor unions, German-European relations, European attitudes towards the United States, and his literary works. There are also some manuscripts dealing with the Balkans and the Near East during World War II. An extensive file of photographs depicts, Albania, Asia Minor, Baghdad, the Balkans, Constantinople, Genoa, the German naval fleet, the Hochschule für Politik, hot air balloons, Italy, the Mediterranean, Turkey, the Turkish Revolution, the United States, Versailles, and Weimar. There are books from Jäckh's library, some with marginal notes, some signed and inscribed to him as well as copies of his own works.

Personal and professional papers of the notable literary critic. The collection includes correspondence, manuscripts, notes, journals, photographs, drawings and films, and a collection of signed and annotated books and magazines from Dupee's library.