Hunsaker was involved in adult education for over sixty years. Papers include brochures, clippings, correspondence, memoranda, pamphlets, reports, speeches, audiorecordings of interviews, and materials related to Hunsaker's thesis. Best represented are the dissertation materials, his international activities with World Education, U.S. Agency for International Development (USAID) and UNESCO, and his activities related to professional conferences and seminars. Of interest are the papers related to his China and Middle East tours. Significant correspondents include Rewi Allen, George E. Davis, Thomas B. Keehn, Paul Sheats, and Hunsaker's family. Among the personal papers are those concerning Hermann H. Field, for whom Hunsaker acted as absentee executor.

Files of the American educator (1907-1984). Personal files include oral history, correspondence from and about Theodor Wilhelm, memorabilia, photographs, material on Nazi education, student papers, speeches, selected writings, some audio-visual material, etc. There are organizational records for several California education organizations as well as a number of key national adult education organizations including the Adult Education Association of the U.S.A., Association of University Evening Colleges, Center for the Study of Liberal Education for Adults, National Association of State Universities and Land-Grant Colleges, National University Extension Association, UNESCO, and University Council on Education for Public Responsibility. There are also more than 40 subject and country files and information on meetings and conferences, and two audiorecordings.