Marie Tremaine's bibliography was originally published by University of Toronto press in 1952 and has been described as 'the cornerstone of bibliography and book history studeis in Canada.' This supplement corrects the original books and adds considerably to its contents. In addition to verifying as many of Tremaine's original library locations as possible, and identifying additional copies of the items, the authors have added the many new entries that have come to light in the last forty-five years The new work is an analytical bibliography of previously unrecorded eighteenth-century Canadian imprints and a source for the study of early print culture in the Maritimes, Quebec, and Ontario. The definition of imprint has been extended to encompass all products of the press, from books and official documents to job printing such as handbills, commercial notices, licences, and land grants. The work includes a transcription of the accountsof more than thirty years of book and job printing from the Brown Neilson office in Quebec City, the most extensive collection of business records left by an early Canadian print shop.