The Hartley A. Soule Papers include notes, memoranda, calculations, and drawings on the High-Speed Flight Research Station (1950-1954); Research Airplane Program (1953-1957); X-15 program (1958-1962); Dyna Soar program (1957-1962); Projects Mercury and Gemini (1961-1962); and history of the high-speed aircraft program (1963-67). Materials are arranged in two series. Series I: Papers, includes notes, correspondence, memos, subject files, and work projects. Series II: Publications, contains bound reports, scientific publications, and journals.