This fonds contains financial records of Assumption College and University, ca. 1856-1999. These include general cash books, financial statements, correspondence, and records of accounts, as well as real estate acquired, constructed, maintained, or sold by Assumption and/or the Basilian Fathers in the vicinity of the present-day campus, from Tecumseh Road north to the Detroit River. Included are land deeds, contracts, and other legal documents, as well as architectural or schematic drawings and specifications for campus buildings. Notably, this includes records of property acquired in the early days of the college, and campus properties sold by Assumption in the 1960s to the University of Windsor. Of special note: a small number of 1950s-1960s records relating to Essex College, the non-denominational affiliated college that helped secure provincial government funding for the campus.

This fonds principally contains records connected with the Congregation of St. Basil (Basilian Fathers) whose members administered Assumption College and Assumption University from 1870 onward. Secondarily, it contains varied records that document the history of Assumption and its evolution over time. Included are legal documents, memos, correspondence, ephemera, constitutions and rules, historical narratives and memoirs, reports, and a variety of Basilian publications and formal histories of Assumption. Some items pertain to Catholic education broadly, or to the history of the Catholic Church in Southwestern Ontario. Of special note are Assumption fight songs and a victory song, and the Second World War war diary of Rev. Mike Dalton, a military chaplain.