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Mercator's Projection with the Great Circle (shortest sailing) or Air Lines Illustrating the directness & capacity of the River St. Lawrence from Lake Erie to the Atlantic As a means of communication  ... [View full title] between Europe and the Commercial Centres of the Great West. Shewing also the position of the Canadian Pacific Railway in relation to the Commerce of the North Atlantic and Pacific Oceans and the extension of the American Pacific and other United States R'ways through Canada as the shortest route to Europe, also the cable system of the Atlantic. Prepared for the Board of trade and the Corn Exchange Association of Montreal by Thos. C. Keefer, C.E. Ottawa 1877. [cartographic material] Keefer's communications map, 1877