TY  - BOOK
CN  - EP 4.2:
CY  - [Washington, D.C.?] :
DA  - [1993]
ID  - 223526
KW  - Radon
KW  - Indoor air pollution
KW  - Radioactive pollution of soils
N1  - "This document was prepared ... in conjunction with the U.S. Geological Survey (USGS)"--Acknowledgements.
N1  - "September 1993."
N1  - Shipping list no.: 99-0482-M.
N1  - "402-R-93-051"--Cover.
PB  - Radon Division, Office of Radiation and Indoor Air, U.S. Environmental Protection Agency,
PP  - [Washington, D.C.?] :
PY  - [1993]
T1  - EPA's map of radon zones.
TI  - EPA's map of radon zones.
ER  -