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Midwestern Basins and Arches COSUNA (MBA)
Coordinator Robert H. Shaver and a regional working group correlated parts of easternmost Wisconsin, Illinois, Michigan, Indiana, western Ohio, eastern Kentucky, central Tennessee, and northernmost Alabama. The COSUNA region includes CSD districts 300 (Cincinnati Arch), 305 (Michigan Basin), 310 (Wisconsin Arch), and 315 (Illinois Basin).
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