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1Water-quality assessment of Francis E. Walter reservoir, Luzerne and Carbon Counties, Pennsylvania /by Barker, James L., 1936-“...U.S. Geological Survey ;...”
Published 1983
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2by Barker, James L., 1936-“...U.S. Geological Survey,...”
Published 1989
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3by Barker, James L., 1936-“...Dept. of the Interior, U.S. Geological Survey ;...”
Published 1989
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4by Barker, James L., 1936-“...United States Department of the Interior, Geological Survey,...”
Published 1977
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5Bacteriological water quality of Tulpehocken Creek basin, Berks and Lebanon Counties, Pennsylvania /by Barker, James L., 1936-“...Dept. of the Interior, Geological Survey, Water Resources Division ;...”
Published 1978
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