@article{222790,
      recid = {222790},
      title = {EPA's map of radon zones.: National summary [microform].},
      publisher = {U.S. Environmental Protection Agency, Air and Radiation,},
      address = {[Washington, D.C.] :},
      pages = {1 v. (various pagings) :},
      year = {1993},
      note = {Cover title.},
      url = {http://library.usi.edu/record/222790},
}