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1 Introduction »^ 1 Purpose and scope 1 General description of the study area 1 Methods of study 3 Previous investigations 3 Acknowledgments ^ 12 Water quality 12 Sites studied 15 Field measurements ^ 15 Temperature 15 pH _ 15 Acidity 45 Dissolved oxygen 45 Silica » 48 Cations ^ 48 Aluminum 51 Barium 51 Boron ^ 51 Cadmium 51 Calcium 52 Cobalt 52 Copper 52 Iron 52 Lead 60 Lithium 60 Magnesium 60 Manganese 60 Nickel ^ 60 Potassium 62 Sodium ^ 62 Strontium 63 Zinc ^ 63 Anions ^^ 63 Alkalinity ^^^ 63 Chloride 63 Fluoride 63 Nitrogen 64 Sulfate 64 Summary ^ 66 Selected references 66

Water quality of large discharges from mines in the anthracite region of eastern Pennsylvania