1. National Health Survey: Blood Pressure of Adults by Race and Area: United States 1960-1962. US Department of Health Education and Welfare National Center for Health Statistics Series II No. 5. Washington DC US Government Printing Office 1964
2. National Health Survey: Blood Pressure of Persons 18-74 Yean in the United States 1971-1972. US Department of Health Education and Welfare National Center for Health Statistics Series II No. 150. Washington DC US Government Printing Office 1975
3. Epstein FH Eckoff RD: The epidemiology of high blood pressure geographic distributions and etiologic factors in Stamler R Pullmon T (eds): The Epidemiology ofHypertension. New York Grune & Stratton Inc 1967 p 155
4. Comstock GW: An epidemiologic study of blood pressure levels in a bi-racial community in the Southern United States. AmJHyg 1957;65:271-278
5. Vital Statistics of the United States 1973 Volume II: Mortality Pathology. US Department of Health Education and Welfare Public Health Service National Center for Health Statistics-Washington DC US Government Printing Office 1977