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Consumer Factsheet On: Thallium
Questions and answers related to the presence of thallium, "a metal found in natural deposits as ores containing other elements," in the drinking water supply. Discusses safe levels of thallium according to the Safe Drinking Water Act, health and environmental effects of thallium, and related topics. From the U.S. Environmental Protection Agency (EPA).
http://www.epa.gov/safewater/contaminants/dw_contamfs/thallium.html

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