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Continue to ChatIron Ore, Coal and Blast Furnaces in the United States. Illustrated map from Fortune Magazine, 1931. [1342×1706] http://www.johnjasonfallows.com/2015/07/18/iron-ore-coal-and-blast-furnaces-in-the-united-states-illustrated-map-from-fortune-magazine-1931-1342x1706-2/