National Water-Quality Assessment (NAWQA) Program
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By Robert J. Gilliom and Gail P. Thelin
U.S. Geological Survey Circular 1131
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U.S. Department of the Interior | U.S. Geological Survey URL: http://water.usgs.gov/nawqa/pnsp/pubs/circ1131/table6.html Page Contact Information: nawqa_whq@usgs.gov Page Last Modified: Friday, 23-Nov-2007 13:10:47 EST