Primarily manuscripts (holograph scores and sketches) and printed music, writings of Edward Steuermann, and correspondence of Edward and Clara Steuermann. The music includes most of Steuermann's compositions, his arrangements of works by Busoni, Poulenc, Schoenberg, Webern, and various 18th- and 19th-century composers, ms. scores of works by, among others, Hans Eisler, Erich Itor Kahn, Earl Kim, and René Leibowitz, and printed music from the 18th through the 20th centuries, many with Steuermann's annotations. Correspondence, both general and family, includes letters between the Steuermanns and Arnold Schoenberg, Anton Webern, Ferruccio Busoni, Theodor Adorno, Rudolf and Lorna Kolisch, and René Leibowitz. Writings encompass manuscript and typescript essays by Edward Steuermann, lectures and speeches, program and liner notes, interview transcripts, and letters of recommendation for students and colleagues. Writings by others about Steuermann are also included. Other material includes printed programs, clippings, papers of the Edward Steuermann Memorial Society, financial and legal papers, photographs, and materials acquired by Clara Steuermann between 1974 and 1981 concerning the activities of the International Federation of Library Associations (IFLA).