Includes correspondence, teaching materials, technical files, meetings reports and correspondence, manuscripts and talks, and films of planets taken by Dr. Leighton at Mount Wilson observatory in the late 1950s. The materials relating to the California Institute of Technology include research proposals for funding on design projects for NASA, radio and optical telescope dish designs (Owens Valley Radio Observatory and Keck Telescope), and radio astronomy, and other observational data. Also contains lecture notes to courses by Richard Feynman and Murray Gell-Mann and publication files on Feynman's lectures on physics; and reports, correspondence, and notes relating to his membership in the National Academy of Sciences.