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2. Doug Cain, and Patrick Edelmann, 1986 . A reconnaissance water-quality appraisal of the Fountain Creek alluvial aquifer between Colorado Springs and Pueblo, Colorado, including trace elements and organic constituents. U.S. Geological Survey Water-Resources Investigations Report 86-4085.
3. H-H. Chen, and A. D. Druliner . 1987 . Nonpoint-source.agricultural chemicals in ground water in Nebraska- preliminary results for six areas of the High Plains aquifer. U.S. Geological Survey Water-Resources Investigations Report 86-4338.