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Polychlorinated biphenyls --- Guided missile silos --- Groundwater --- Environmental aspects --- Pollution
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Water quality --- Water quality monitoring stations --- Measurement.
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Water --- Water --- Groundwater --- Nitrogen content --- Pesticide content --- Quality --- Pennsylvania
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Water quality --- Acid pollution of rivers, lakes, etc. --- Acid precipitation (Meteorology) --- Environmental aspects --- Pennsylvania
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Soil chemistry --- Sedimentation and deposition --- Hurricane Katrina, 2005. --- Hurricane Rita, 2005. --- Hurricane Katrina (2005) --- Hurricane Rita (2005) --- 2005 --- Louisiana
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Groundwater --- Water-supply --- Quality
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