%0 Generic %T Radon exposure human health threat : hearing before the Subcommittee on Health and the Environment of the Committee on Energy and Commerce, House of Representatives, One Hundredth Congress, first session on H.R. 2837 ... November 5, 1987. %U https://ezaccess.libraries.psu.edu/login?url=http://congressional.proquest.com/congcomp/getdoc?HEARING-ID=HRG-1987-HEC-0112