Map of Central Canada showing transportation and commercial development

Map depicting part of Central Canada. Extends North to Fort Albany, East to Montreal, South to Port Colborne, and West to Portage la Prairie. Shows land development and natural resources. Legend below title and scale, at upper right, lists symbols for developed and potential agricultural areas, main mineral areas, producing and non-producing principal mining centres, mining divisions, mining recorders offices, smelters, refineries, water power developments, transmission lines, pulp mills, paper mills, roads, winter roads, constructed and proposed railways, and Hudson Bay Company and Revillion Frères trading posts. Note below legend indicates that only agricultural land, main railways, smelters, and refineries are shown. Below this note is: "Prepared by Natural Resources Intelligence Service Dept. of the Interior" and "January 1927". Includes two insets at lower left corner. Leftmost inset, titled "The Cobalt-Porcupine-Rouyn Area", depicts part of Ontario and Quebec around the provincial border, South of Cochrane. The smaller inset to the right of this, titled "The Sudbury Area", depicts Sudbury, Ontario, and surrounding area.