Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows two condensed maps illustrating the distribution of the labour force engaged in manufacturing circa early 1950s. The map has a dot representing every 100 people in the manufacturing labour force, with places of 1000 or more people in manufacturing being shown as proportional circles, instead. There are additional data for the 18 census metropolitan areas. This consists of a pie graph for each of these places showing the breakdown of the manufacturing labour force into each of 16 manufacturing industry types. The total manufacturing labour force in each of the census metropolitan areas is also given.