1. Barr DB, Bravo R, Weerasekera G, Caltabiano LM, Whitehead RD, Jr., Olsson AO et al. Concentrations of dialkyl phosphate metabolites of organophosphorus pesticides in the U.S. population. Environ Health Perspect 2004; 112: 186–200.
2. USEPA. Pesticide Industry Sales and Usage—2006 and 2007 Market Estimates. Office of Chemical Safety and Pollution Prevention, US Environmental Protection Agency (USEPA): Washington, DC. 2011.
3. USDA-NASS Data for Washington from the agricultural chemical use database, 2011 USDA-NASS, Washington, DC.
4. USEPA Azinphos-methyl Phase-out 2009. Available from
http://www.regulations.gov/#!docketDetail;D=EPA-HQ-OPP-2005-0061
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5. USEPA Reregistration eligibility decision for chlorpyrifos. EPA 738-R-01-007; EPA: Washington, DC.