1. Map of central Canada showing transportation and commercial development Maps University Of Minnesota Public content 1927. Canada. Natural Resources Intelligence Branch. Insets: The Cobalt-Porcupine-Rouyn area. Scale [approximately 1:1,100,000] -- The Sudbury area. Scale [approximately 1:1,100,000]. 33 x 60 Centimet... Dept. of the Interior (Ottawa).