Series III contains correspondence, programs, and publicity related to Paul Hindemith. The majority of correspondence consists of Stone's letters to Hindemith; only one, undated letter from Hindemith is included. Much of the correspondence concerns Paul Hindemith: Catalogue of Published Works and Recordings, which was prepared by Stone and published in 1954. Several drafts and proofs of the catalogue can be found in this series. Stone corresponded with Hindemith until his death in 1963. Several obituaries and memorial concert programs are included in this series.