Environmental Health Perspectivesis a peer-reviewed journal affiliated with the National Institutes of Health, National Institute of Environmental Health Sciences and the Department of Health and Human Services. EHP focuses on the effects of the environment on human health and the link below is to a study published in 2002 by Monte Greer et.al. entitled Health Effects Assessment for Environmental Perchlorate Contaminant: The Dose Response for Inhibition of Thyroidal Radioiodine Uptake in Humans.
The University of California Sustainable Agriculture Research and Education Program compiled the National Organic Standards Board Technical Advisory Panel Review on Chilean Nitrate for general use in crop adjuvant production for the USDA National Organic Program. This is a link to the analysis.
The United States Environmental Protection Agency (EPA) oversees all issues surrounding the environment. They develop and enforce environmental regulations, conduct research, and promote voluntary programs and education about the environment. The following is a link to EPA's Survey of Fertilizers and Related Material for Perchlorate in May 2001.