A map of Northwestern United States and neighboring Canadian Provinces / prepared in the Cartographic Section of the National Geographic Society for the National geographic magazine ; James M. Darley, chief cartographer.National Geographic Society (U.S.). Cartographic Section1941"Culture by Apphia E. Holdstock. Research by Wellman Chamberlin. Physiography by John J. Brehm."Issued with the National geographic magazine, v. 79, no. 6, June 1941.Relief shown by hachures and spot heights.Shows routes of exploration and includes notes on historical sites and points of interest.cartographic