Fonds consists of research material and correspondence relating to Williams' books on legal history. The files are arranged in 11 series: "Matthew Baille Begbie" series, "Duff: a life in the law" series, William Gosse on "Duff" series, "Just lawyers: seven portraits" series, "With malice aforethought" series, "Mayor Gerry: the remarkable Gerald Grattan McGeer" series, "100 Years at St. Peter's Quamichan" series, "A history of Vancouver's Terminal City Club series, "Trapline outlaw: Simon Peter Gunanoot" series, Correspondence, and Miscellaneous transcripts.