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Zimmerman, L.R.; Strahan, A.P.; Thurman, E.M., Method of Analysis and Quality-Assurance Practices by the U.S. Geological Survey Organic Geochemistry Research Group. Determination of Four Selected Mosquito Insecticides and a Synergist in Water Using Liquid-Liquid Extraction and Gas Chromatography/Mass Spectrometry, Toxics Substances Hydrology Program, U.S. Geological Survey, Lawrence, Kansas, 2001, 17. [all data]