Series A, Methodological report
Public Health Service, National Center for Health Statistics
Public Health Service, National Center for Health Statistics 1987 Series A, Methodological report no. 2 , DHHS publication no. 87-20002
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U.S. Dept. of Health and Human Services, Public Health Service, National Center for Health Statistics 1983 Series A, Methodological report no. 1 , DHHS publication no.83-20001
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