Hardy, M. A., Geological Survey (U.S.)., United States. National Park Service. (1981). Effects of coal fly-ash disposal on water quality in and around the Indiana Dunes National Lakeshore, Indiana. Indianapolis, Ind.: U.S. Geological Survey.MLA Citation
Hardy, Mark A, Geological Survey (U.S.), and United States. National Park Service. Effects of Coal Fly-ash Disposal On Water Quality In And Around the Indiana Dunes National Lakeshore, Indiana. Indianapolis, Ind.: U.S. Geological Survey, 1981.
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