This series contains materials that shed light upon Oppler's personal and professional life. Included are a photocopy of a book of poems authored by Oppler's father Leo, photographs, and photocopies of his published obituaries. Also included are a handful of materials documenting his daughter Ellen's career as an art historian.
This series contains documents generated in connection with Oppler's memoir, Legal Reform in Occupied Japan: A Participant Looks Back (Princeton University Press, 1976), including correspondence, reviews, and readers' notes. Of note are several typescript passages about life in Japan that were excised from the final version and a brief note from Supreme Court Justice William O. Douglas (October 23, 1974).
This series contains documents generated in connection with Oppler's writing and editorial work for the Encyclopedia of Japan (Kodansha, 1980), among them Oppler's entries on the 1961 Sunakawa Case and the Japan-U.S. Security Treaties, an entry that he helped to content-edit, and an entry written by Kurt Steiner concerning Oppler's work in Japan. Also included are newsletters published by the staff of the Encyclopedia of Japan; the Spring 1979 issue contains a poem that Oppler wrote in praise of the project.