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 20. Intensity of annual agricultural use of (A) herbicides and (B) insecticides in 37 agricultural basins. Each point represents use in one basin. Agricultural-use data are from Gianessi and Anderson (1996).

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