A comparison study of the nitrogen and phosphorous concentrations in the Mississippi, Nelson and Niobrara River basins
Strawhorn, Neil J.
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It has been hypothesized that the absolute quantities of nitrogen and phosphorous in the Upper Mississippi River Basin are higher than they normally would be without the influence of man's activities and without the presence of navigation pools. The purpose of this study is to support this hypothesis by establishing a set of control values for nitrogen and phosphorous levels.