Upper Midwest Environmental Sciences Center
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Year 1999 Findings for the Long Term Resource Monitoring Program| Figure 4. | Concentrations (mg/L) of nitrate + nitrite above (red dots) and below (black line) La Grange Pool of the Illinois River, 1993–1999. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/reports_publications/ltrmp/1999/summary_findings/figure04.html
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Page Last Modified:
December 31, 2012
