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Radon Fact Sheet from the Massachusetts Department of Public Health (MA DPH):
http://www.mass.gov/eohhs/gov/departments/dph/programs/environmental-health/exposure-topics/iaq/radon/
A Citizens' Guide to Radon from the United States Environmental Protection Agency (EPA):
https://www.epa.gov/radon/citizens-guide-radon-guide-protecting-yourself-and-your-family-radon