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<br />N <br />~. <br />C..11 <br />--J <br /> <br />IMPLEMENTATION PLAN FOR THE NATIONAL WATER-QUALITY <br />ASSESSMENT PROGRAM <br /> <br />By P.P. Leahy, J.S. Rosenshein, and D.S. Knopman <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Open-File Report 90-174 <br /> <br /> <br />Reston, Virginia <br />1990 <br /> <br />