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1by Williams, Donald R.Subjects: “...Acid mine drainage Environmental aspects Pennsylvania Somerset County....”
Published 1996
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2by Cravotta, Charles A., IIISubjects: “...Mine drainage Environmental aspects Pennsylvania....”
Published 2005
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3by Chaplin, Jeffrey J.Subjects: “...Mine drainage Environmental aspects Pennsylvania Dauphin County....”
Published 2005
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4by Williams, Donald R. (Hydrologist), Sams, James I., Clark, Mary E. (Mary Eileen), 1970-Subjects: “...Acid mine drainage Environmental aspects Pennsylvania Somerset County....”
Published 1996
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5by Kostelnik, Kevin M.Subjects: “...Acid mine drainage Environmental aspects Pennsylvania Meadow Run Watershed....”
Published 1989
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6by Cravotta, Charles A., IIISubjects: “...Mine drainage Environmental aspects Pennsylvania Cambria County....”
Published 2005
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7by Fishel, David K.Subjects: “...Mine drainage Environmental aspects Pennsylvania....”
Published 1988
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