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Altitudes. --- West Virginia --- West Virginia.
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Leveling --- Bench-marks --- Altitudes. --- West Virginia --- West Virginia.
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Coal mines and mining --- Groundwater --- Coal mines and mining. --- Environmental aspects --- Pollution --- Pollution. --- West Virginia.
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Leveling --- Bench-marks --- West Virginia --- West Virginia. --- Altitudes.
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West Virginia --- West Virginia. --- Altitudes.
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Coal mines and mining --- Groundwater --- Environmental aspects --- Pollution --- West Virginia.
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Mine water --- Drinking water --- Water quality --- Water-supply --- Mine water. --- Water quality. --- Water-supply. --- Quality --- West Virginia.
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Mine water --- Drinking water --- Water quality --- Water-supply --- Quality --- West Virginia.
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