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Total nitrite plus nitrate nitrogen and total phosphorus yields at selected sites in the Upper Mississippi River Basin study area, water years 1984-93 (shown in downstream order).
Site
number
(fig. 1)
Water-quality site
Yield, units are in tons/square mile/year
Location
Total nitrite plus nitrate nitrogen
Total phosphorus
6
Rum River
0.24
0.06
9
Minnesota River
3.95
0.10
17
St. Croix River
0.08
0.03
18
Kettle River
0.08
0.05
23
Vermillion River
1.24
0.05
25
Straight River
8.22
0.30

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