Subject files contain diverse formats and span a wide time range, as Gill collected, compiled, and repurposed materials throughout his long career. These files pertain to subjects in penology and criminology and include bibliographies, clippings, correspondence, lecture materials, notes, photographs, printed materials, reports, and syllabi. Notable subjects include John Case, Gill’s friend and warden at the Bucks County Prison in Pennsylvania; Charles... Morris, assistant director of the Institute of Correctional Administration; and Charles Stastny and Gabrielle Tyrnauer, Gill’s research assistants. Other named files relate to penologists, criminologists, former students, or criminals. Research notes consist of the extensive observations Gill made while reading.