Series III, Correspondence (1912-1963) includes routine, social, personal and business information, both incoming and outgoing. Additional correspondence may be found in Series IV, which pertains to his tenure in Persia, and in Series VII, Subject Files. Business correspondence concerns publication of Hall's articles and books and from his literary agent. Some materials are in French, a few in Farsi. Correspondence is both manuscript and typescript.

This series includes a variety of records that document the class years 1941 to 1950.

The Events series contains audiovisual materials pertaining to events held on campus, to include celebrations/dedications, theatrical performances, and conferences. Series also contains newsreels and documentary materials related to campus events. The Events series is arranged into five subseries: Conferences/meetings, Celebrations/Dedications, Documentaries/Entertainment, Judicial hearings, and Theater.

Consists of correspondence with individuals such as Sherwood Anderson, e. e. Cummings, William Faulkner, F. Scott Fitzgerald, Ernest Hemingway, Marianne Moore, Katherine Anne Porter, and Edmund Wilson, as well as others.

The Biographical series contains materials regarding Baker's career and life and includes articles, interviews and oral histories, his diaries, awards and appointments, family correspondence, photographs, and weekly schedules for his retirement years. The articles include papers written by and about Baker regarding his life, as well as materials collected by A. Michael Noll on three CDs. The earlier diaries include references to his research at Bell Labs, while diaries beginning in the 1950s are predominantly concerned with his daily life. The awards and appointments materials include awards certificates, correspondence about accepted the awards and congratulations, his acceptance speeches, programs, and articles. Most awards are from academic and professional organizations or corporations for his contributions to science, from government agencies for his service, and honorary degrees from universities. The photographs include portraits of Baker, Baker receiving awards, at events, or with members of boards he served on, and personal photographs of unidentified people and landscapes. The weekly schedules record meetings and events that Baker attended, and also include correspondence about the events, itineraries, and expenses.