1. Uncertainties About Health Effects of Radon;Abelson;Science,1990
2. Mineral Dusts and Radon in Uranium Mines;Abelson;Science,1991
3. National Safety Council Radon Information Page http://www.nsc.org/ehc/radon.htm
4. NEHA-National Radon Proficiency Program http://www.radongas.org/
5. Radon information from the U.S. EPA http://www.epa.gov/iaq/radon/