References

EPA.     1997, Environmental Radiation Data.  Report 91.  United States Environmental Protection Agency, Office of Radiation and Indoor Air, Montgomery, AL.

EPA.     2002, Environmental Radiation Ambient Monitoring System Database, United States Environmental Protection Agency, Montgomery, AL.  Data file sent via e-mail communication from Tonya Hudson to Ron Warren on 1/11/02.

NCRP.  1987, Exposure of the population in the United States and Canada from natural background.  Report 94, National Council on Radiation Protection and Measurements, Bethesda, MD.

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