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2by Pickering, K. E., Vilardo, J. M., Schakenbach, J. T., Elliott, D. L., Barchet, W. R., George, R. L.Subjects: “...Pennsylvania...”
Published 1980
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19by Arthur, M. A.“... in the US Geological Survey (W.E. Dean, P.I.) and University researchers led by The Pennsylvania State...”
Published 1993
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20by Arthur, Michael A.“... in the US Geological Survey (W.E. Dean, P.I.) and University researchers led by The Pennsylvania State...”
Published 1993
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