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.
The class notes and syllabi in this subseries were generated in connection with several courses in public administration that Oppler took, but most of the materials in this subseries consist of reading notes taken while he was researching "Prussian Bureaucracy and National Socialism". Oppler housed his research notes in sequentially numbered three-ring binders. This order was preserved and folder notations indicate the notebook in which each group of documents was placed; in several instances, loose documents produced at a later date were removed and placed in the Writings or Research Materials subseries.