Consists of the draft manuscript of Delarue's unpublished autobiography, Memoirs of a Balletomane, photographs of Delarue, and approximately 250 letters (1930-1990) received by Delarue from various European and American friends, associates, and people involved in dance and the theater. Correspondents include Marian Hannah Winter (133 letters), also a dance historian, Anibal Navarro (80 letters), Eugene Berman (25), Paul Bowles (29), Stanislav Buzek, Paul Cadmus, Anton Dolin, Margot Fonteyn, John Hall, Pavel Tchelitchev, Alice B. Toklas, and others. There is also an extensive series of letters (1941-1960) by Delarue to Alexander D. Wainwright, lifetime friend and Princeton classmate.

An addition to the collection consists of approximately 170 objects collected by Delarue, relating to the ballet and its history, including porcelain figurines, paintings and portraits, drawings, engravings, costume designs, lithographs, prints, posters, musical scores, and printed books. There are representations, in various forms, of Fanny Elssler, Marie Taglioni, Fanny Cerito, Waslaw Nijinsky, and others by such artists as F. Kruger, Pablo Picasso, Marc Chagall, Joseph Eymer, Paul Cadmus, Faivre, Lerasseur, and others.