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US Dept EPA's findings on Granite Countertops
http://www.epa.gov/radiation/tenorm/granite-countertops.html
Akron Univeristy's Study of Radon and Granite Countertops
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http://www.epa.gov/radiation/tenorm/granite-countertops.html
Akron Univeristy's Study of Radon and Granite Countertops