Correspondence and drafts pertaining to Salpeter and Hans Bethe's work in Handbuch der Physik XXXV; also, correspondence, announcements, reports, reprints, lecture notes, examinations and other material pertaining to Salpeter's involvement with the National Science Foundation and the National Science Board, especially concerning national science policy. Also, includes autobiography of Edwin's father, Jakob Salpeter and minutes of the Arecibo Technical Committee meetings.