Browse Special Publications - Illinois Natural History Survey by Subject "Wassergüte"

  • Karr, James R. ([Champaign, Ill.] :Illinois Natural History Survey,[1986], 1986-09)
    A recent nationwide USEPA study found that 56% of the stream segments with water resource degradation had a reduced fishery potential because of chemical problems however, 50% were impaired by degradation in physical habitat ...


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