Recorded lectures dating primarily from the 1950s - 1970s. Audiocassettes, circa 1960-1978, document lectures given by both Gill and Robert Crosswhite, executive director of the Prisoners Aid Society of Delaware. Reel-to-reel audiotapes, circa 1959-1970, document lectures and interviews given by a number of sociologists and psychologists, including Gill and his wife Isabelle Kendig, on topics related to juvenile delinquency, probation and parole, counseling and guidance, clinical criminology, as well as general prison administration and reform. Edison Electronic Voicewriter phonograph records, circa 1950-1952, document lectures which may have been held at the University of Wisconsin, where Gill served as a professor of sociology.