Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows four condensed maps of the World, depicting the state of international affairs involving Canada circa late 1950s. The top left map shows countries of the Commonwealth. Dependencies of the countries shown on this map are also indicated. The top right map shows member states of the North Atlantic Treaty Organization, and the Canadian delegation to the North Atlantic Council along with member and cooperating states and the permanent delegation of Canada for the Organization for European Economic Cooperation. The bottom left map shows member states of the Colombo Plan for Cooperative Economic Development in South and Southeast Asia along with locations of Canadian Trade Commissioners, Commercial Counselors and Commercial Secretaries. The bottom right map shows the member states, trust territories and mandates of the United Nations Organization. Locations of Canadian diplomatic representation abroad are also shown on this map. These four maps are projected in the North Polar Azimuthal Equidistant projection with the longitude of the central meridian being at 100 degrees W.