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Water quality --- Groundwater --- Aquatic biology --- National Water-Quality Assessment Program (U.S.) --- Mississippi River Watershed.
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Groundwater --- Groundwater flow --- Aquifers --- Pollution --- Minnesota.
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Water quality --- Water quality --- Water quality --- Minnesota. --- Mississippi River Watershed. --- Wisconsin.
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Water-supply --- Sleeping Bear Dunes National Lakeshore (Mich.) --- Michigan
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Groundwater flow --- Groundwater --- Coal-tar --- Aquifers --- Pollution --- Environmental aspects --- Minnesota. --- Minnesota
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Water --- Groundwater --- Pollution
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Groundwater --- Pollution --- Wurtsmith Air Force Base (Mich.) --- Michigan --- Michigan.
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Water quality --- Aquifers --- Minnesota. --- Mississippi River Watershed. --- Wisconsin.
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Water quality --- Stream measurements --- Streamflow --- Mathematical models.
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