1739-1740, Documents annotés, Montréal, Eusèbe Senécal et fils, 159 p. Tanguay, Cyprien (1886), À travers les registres, Montréal, Librairie Saint-Joseph, 276 pp. Tanguay, Cyprien (1893), Répertoire Général du Clergé Canadien par ordre chronologique depuis la fondation de la colonie jusqu’à nos jours, Montréal, Eusèbe Senécal et fils, Imprimeur, 526 pp. L'abbé Cyprien Tanguay, Roman Catholic priest and genealogist, is the author of the DGFC Dictionnaire of French-Canadian families. A plaque marks the site of the house in which he lived in the Lower Town area of Ottawa not far from the National Art Gallery and the Byward Market. Tanguay's original research and extensive publications placed French-Canadian genealogy on a solid footing, which has proven a great benefit not only to French Canadians but to the millions of Canadians and Americans and others who have one or more French-Canadian ancestors. His DGFC Dictionnaire contains many errors and some unsupported speculation about incomplete marriages. The DGFC Dictionnaire is a fundamental reference work for French-Canadian genealogy. Its seven volumes, containing more than 4,350 pages, have been published in a facsimile edition by Élysées Éditions in 1975, with a bonus volume by Abbé Tanguay's À travers les registres, also available on CD-ROM format. The CD contains Tanguay's DGFC Dictionnaire and the following other important works : Joseph-Arthur Leboeuf's 600-page Complément a Tanguay, Tanguay's 276-page A travers les registres and Tanguay's 526-page Repertoire général du clergé canadien. Tanguay's work has been supplemented by the research and publications of others, including by Leboeuf, as above, and Abbé Archange Godbout's Origine des familles canadiennes-françaises, but was not supplanted until a century later. It contains over 2,000,000 births, deaths and marriages with other notes covering the period from the founding of New France to the early 19th century. DGFC Dictionnaire's influence René Jetté summarizes Tanguay’s contribution along the following three dimensions : Tanguay was the starting point of an autonomous genealogical production, independent of jurists or historians; He believed every person has ancestors, not just a titled minority; He believed that genealogy is established only on evidence DGFC Dictionnaire user utilisation over time has evolved to include: An American reprinting in 1969 by Arms Press. The Québecois reprinting in 1975 by Elysée. The CD-ROM format available from Originis in 2001. More recent internet availability including in terms of very recently making Tanguay's major works available via Bibliothèque et Archives nationales du Québec. The Québec-based Institut généalogique Drouin's founder,