This report is part of a series of pesticide trend assessments led by the National Water-Quality Assessment Program of the U.S. Geological Survey. This assessment focuses on major rivers of various sizes throughout the United States that have large wat
Ryberg, Karen R. kryberg@usgs.gov,Vecchia, Aldo V.,Gilliom, Robert J. rgilliom@usgs.gov,et al. Pesticide trends in major rivers of the United States, 1992-2010. 2014-01-01.