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<br />Aq1 Us. Geo /O!)I (ttJ SurvtJ( <br /> <br />t1 ~;). d-... <br /> <br />NITROGEN AND PHOSPHORUS DATA FOR <br />SURFACE WATER IN THE UPPER COLORADO <br />RIVER BASIN, COLORADO, 1980-94 <br /> <br /> <br />~o <br /> <br />~=- <br />~s:> <br />() <br /> <br />, <br /> <br /> <br />National Water-Quality <br />Assessment Study Unit <br /> <br />u.s. GEOLOGICAL SURVEY <br />Open-File Report 97 -233 <br /> <br /> <br />NATIONAL WATER-QUALITY ASSESSMENT PROGRAM <br />