1. U.S. Bureau of Mines, Minerals Yearbook, 1968, U.S. Government Printing Office, Washington, D.C. (1969).
2. “Lead Isotopes in Gasoline and Aerosols of Los Angeles Basin, California,”;Chow;Science,1965
3. “Isotopic Composition as a Natural Tracer of Lead in the Environment,”;Ault;Environ. Sci. Technol.,1970
4. “Nuclear Geology,”;Faul,1954
5. “Lead Isotopes in Geology,”;Russell,1960