Hardy, M. A., Geological Survey (U.S.)., United States. National Park Service. (1984). Chemical and biological quality of streams at the Indiana Dunes National Lakeshore, Indiana, 1978-80. Indianapolis, Ind.: U.S. Geological Survey .MLA Citation
Hardy, Mark A, Geological Survey (U.S.), and United States. National Park Service. Chemical And Biological Quality of Streams At the Indiana Dunes National Lakeshore, Indiana, 1978-80. Indianapolis, Ind.: U.S. Geological Survey , 1984.
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