The fonds documents the involvement of the Jesuits at the Church of Our Lady in Guelph, Ontario, as well as the Jesuit missions for Catholic residents of the region. The fonds mainly includes information detailing the history, activities, and development of the Church of Our Lady, the Catholic communities in Guelph, and the Jesuits who worked there. It contains correspondence, unpublished essays, newspaper clippings, cemetery records, publications, architectural plans, pamphlets, postcards, and photographs.