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epa.gov
epa.gov
EPA assessment of risks from radon in homes(PDF) (报告). Office of Radiation and Indoor Air, United States Environmental Protection Agency. 2003 [2021-08-26]. (原始内容存档(PDF)于2021-03-19).
EPA assessment of risks from radon in homes(PDF) (报告). Office of Radiation and Indoor Air, United States Environmental Protection Agency. 2003 [2021-08-26]. (原始内容存档(PDF)于2021-03-19).
EPA Facts about Radon(PDF) (报告). United States Environmental Protection Agency: 1–3. [22 February 2019]. (原始内容存档(PDF)于2021-08-26).