Fonds consists of correspondence, reports, agreements, by-laws, minutes, newsletters, newspaper clippings, workshop notes, maps, and photographs relating to the Keele Valley Landfill, the Oak Ridges Moraine, Toronto and GTA environment, and planning and development in Maple.

Fonds consists of plans, reports, studies, correspondence, published materials, essays, and newspaper clippings which document the planning and development of Vaughan. Specific Vaughan topics within the fonds include the Maple dump, the Maple theme park, the Woodbridge annexation, and the building of the Vaughan industrial park, to name but a few. Moreover, official plans and studies for Thornhill, Maple, Kleinburg, Nashville, and Woodbridge provide invaluable evidence as to the evolutionary development of these communities.