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2. International Petroleum (Oil) Reserves and Resources;EIA,2007
3. Drinking Water Regulations Radionuclides;EPA,1976
4. EPA, 1978. Natural Radioactivity Contamination Problems, a Report of Task Force, prepared by Conference of Radiation Control Directors, U.S. Nuclear Regulatory Commission, U.S. Department of Health, Education and Welfare, and U.S. Environmental Protection Agency.
5. Draft Diffuse NORM Waste Characterization and Preliminary Risk Assessment;EPA,1991