This series includes Herrick's files on a variety of subjects. These materials reflect his professional and personal interests, including early computers, minor planets, space exploration, and piano music. Notable materials include Aeronutronic Systems Division-Ford files, Technical Study #3, mathematics publications, Jet Propulsion Laboratory reports, files on Betulia, Icarus, Geographos, and Jupiter IX and XII, Minor Planet Center Notices, and notes on navigation.