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3. Daniel, T. C., P. E. McGuire, G. D. Bibenzer, F. W. Madison, and J. G. Konrad. 1978. Assessing the pollution load from nonpoint sources: planning considerations and a description of an automated water quality monitoring program.Environmental Management 2:55–65.
4. EPA-905/9-77-007D;D. R. Dudley,1977
5. Evans, R. L. and D. G. Schnepper. 1977. Sources of suspended sediment: Spoon River, Illinois. Presented at the North Central Section Geological Society of America, Southern Illinois University.