1. Material balance for automobile-emitted lead in Los Angeles basin
2. United States Department of Commerce/Bureau of the Census. Number of inhabitants. U. S. Summary Final Report 1970 Census of Population PC(1)-AI; GPO Washington D. C. 1971.
3. National Academy of Sciences. Lead: Airborne Lead in Perspective. Committee on Biologic Effects of Atmospheric Pollutants Division of Medical Science NRC NAS Washington D. C. 1972.
4. United States Tariff Commission. Synthetic Organic Chemicals United States Production and Sales of Miscellaneous Chemicals for 1968. Washington D. C. 1970.
5. United States Department of Interior Bureau of Mines. Minerals Yearbook Washington D. C. 1936-1970.