Pesticides in Streams of the United States--Initial Results from the National Water-Quality Assessment Program

By Steven J. Larson, Robert J. Gilliom, and Paul D. Capel

U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999

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Figure 9. Distributions of monthly median concentrations of the seven most frequently detected herbicides and the five most frequently detected insecticides at 50 sites during a 1-year period. (See figure 5B and associated text for an explanation of concentration distribution plots.)

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