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<br />jqq+ Sne/hfl) Larv1 K. <br /> <br />g;?1;{~ <br /> <br />FIELD GUIDE FOR COLLECTING AND PROCESSING <br />STREAM-WATER SAMPLES FOR THE NATIONAL <br />WATER-QUALITY ASSESSMENT PROGRAM <br /> <br /> <br />u.s. GEOLOGICAL SURVEY <br />Open-File Report 94-455 <br /> <br /> <br />National Water-Quality Assessment Program <br />Study Units <br /> <br /> <br />.1991 <br />8! 1994 <br />[JJ 1997 <br />