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<br />FIELD GUIDE FOR COLLECTING AND PROCESSING <br />STREAM-WATER SAMPLES FOR THE NATIONAL <br />WATER-QUALITY ASSESSMENT PROGRAM <br /> <br />By Larry R. Shelton <br /> <br />U.S. GEOLOGICAL SURVEY <br />Open-File Report 94-455 <br /> <br />N <br />N <br />I <br />U) <br />Ltl <br />o <br />co <br /> <br />Sacramento, California <br />1994 <br />