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Environmental setting of the upper Illinois River Basin and..:

Arnold, Terri L ; National Water-Quality Assessment Program (U.S.) ; Geological Survey (U.S.)
Also available via Internet from the USGS web site (PDF file only). Address as of 7/27/99: http://il.water.usgs.gov/nawqa/uirb/pubs/reports/envsetrpt.pdf; current access is available via PURL..  , 1999