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1.- Nutrient concentrations and their relations to the biotic integrity of nonwadeable rivers in Wisconsin
Robertson, Dale M.; Weigel, Brian M.; Graczyk, David J.; Wisconsin. Department of Natural Resources
Reston (Virginia): U.S. Geological Survey, 2008
U.S. Geological Survey Professional Paper
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2.- The Gogebic Iron Range: a sample of the northern margin of the Penokean fold and thrust belt
Cannon, William F.; LaBerge, Gene L.; Klasner, John S.; Schulz, Klaus J.
Reston (Virginia): U.S. Geological Survey, 2008
U.S. Geological Survey Professional Paper
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