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Forest History Association Of Wisconsin Educating the citizens of Wisconsin on the history and importance of our forests in the continued growth of our state. Upcoming Webinars Events Fuel for Wisconsins Charcoal Iron Industry Charcoal is a traditional forest product and once was a crucial part of Wisconsins economy providing fuel for many of the states iron furnaces. Production occurred in pits and kilns using interesting methods and wood technology. There were hundreds of charcoal kilns of various types scattered across Wisconsin mostly along railroads and they became local landmarks.