1. National Center for Health Statistics, U.S. Decennial Life Tables for 1969–1971, Volume 2, parts 1–26, 27–51, U.S. Department of Health, Education and Welfare, Rockville, Maryland, 1975.
2. Shimkin D. B., Mortality in Mississippi, 1963–1967: A Search for Environmental Factors in Disease, Milton Olive III Memorial Corporation, Lexington, Mississippi, p. 50, mimeo, 1972.