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This series contains published and unpublished writings, research and lecture notes, and research materials generated or collected while Oppler was a research assistant (1940-44) and instructor at the School for Overseas Administration (1941-44).
This series contains reports, memoranda, speeches, articles, photographs, Japanese government documents and other materials that Oppler created or gathered while working for the Supreme Commander for the Allied Powers (SCAP). The earliest items concern the Japanese constitution, which Oppler played a very minor role in drafting. However, the bulk of the series consists of published and unpublished memoranda, reports, meeting minutes, speech notes, photographs, and other materials Oppler created or collected while working as part of the Government Section (1946-47) and as head of the Courts and Law Division (1947-52).
This series consists of unpublished notes and opinions, photographs, and other documents Oppler created or collected while working as head of the Political and Legal Section of the Far Eastern Command. Of note is an autographed photograph of General Lyman L. Lemnitzer.
This series consists of unpublished opinions, memoranda, official documents, photographs, and press summaries that Oppler generated or collected while serving as the International Relations Officer of the United States Forces Japan (USFJ). Of note are Oppler's "Personal Interest File", which contains clippings, USFJ memoranda and reports, and other documents concerning the affairs of Japan, Korea, and the Ryukyu Islands, and his file of clippings and documents concerning the Sunakawa case, which upheld the constitutionality of stationing United States troops in Japan.
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.
This series consists of correspondence, research notes, speech notes, and published and unpublished articles and essays that Oppler produced or gathered after his 1959 retirement and return to the United States.
This series contains materials that Oppler received from colleagues, gathered while at various Asian studies conferences, or kept for their informational value.