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medium mineral iron ore processing line in Ottawa Canada North America

medium mineral iron ore processing line in Ottawa Canada North America

Apr 01, 2016· Theironranges of Minnesota, Wisconsin, and Michigan—collectively known as the Lake Superior District—had “nourished the US economy for half a century, through two World Wars” (“TheIron OreDilemma,” 1945, 129).Yet the region was slow to develop, because Lake Superior’s distance fromNorthAmerican centers of industrialization posed a critical problem before the Civil War.

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