The Sadayoshi Omoto papers contain material related to his career and personal life. Omoto's professional material include teaching material such as syllabi, lecture notes and exams. Also included are memos, correspondence and committee files relating to the Michigan State University Art Department. There is also material related to Omoto's research and publications on Worthington Whittredge, Queen Anne-style architecture in Ohio, architectural surveys of Michigan, and Japanese American artists. There is also material related to the inventory of Michigan paintings and the subsequent exhibitions, "Early Michigan Paintings" and "The Michigan Experience." Other material includes Omoto’s student notes, and his involvement in the art scene in Leland, Michigan, home to the MSU Summer Art School from the 1940s to 1980s. Also included are materials related to Executive Order 9066 and the Manzanar Relocation Center. Materials include lectures Omoto gave on his experience, articles about Omoto, articles on the Bainbridge Island evacuees, and information on evacuees and their art.