Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows as many populated places in the Great Lakes area as the scale of the map will permit. It also indicates, within certain limits, the number of inhabitants at each place according to the 1951 Census of Canada. The map also distinguishes between those places which were incorporated in cities, towns, and villages, and those which were not. Therefore, it shows the urban municipalities in those parts of Ontario and Quebec covered by the map.