More information can be found on:
the EPA's Home Buyer's and Seller's Guide to Radon
the EPA's A Citizen's Guide to Radon
the EPA's Consumer's Guide to Radon Reduction
How to Find a Qualified Radon Service Professional in Your Area
National Radon Hotline at 800-SOS-RADON
Guidelines for Construction of Radon-Resistant Homes
Council of American Building Officials, One- And Two-Family Dwelling Code, Appendix F. (708) 799-2300.
American Society for Testing and Materials, ASTM Standard Guide (E1465-92). (215) 299-5585.
The EPA, Model Construction Standard (EPA 402R-94-009). (202) 260-7751.