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EnvironmentalChemistry.com
"This site provides environmental, chemistry and hazardous materials news, information & resources including: in depth articles; a detailed periodic table of elements; chemical database; hazmat emergency response guides; hazmat placarding information; and much more." Includes a dictionary and list of hazardous material acronyms, a molar mass calculator, a history of Chernobyl, and images of hazardous materials placards as required by the U.S. Department of Transportation (DOT).
http://environmentalchemistry.com/

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