REFERENCES 1. World Health Organization. Official records; no 28 (Third World Health Assembly 3.6). Geneva: World Health Organization, 16-17. 1950. 2. National Office of Vital Statistics. International recommendations on definitions of live birth and fetal deaths. Washington: Public Health Service. 1950. 3. Statistical Office of the United Nations. Principles for vital statistics system: Recommendations for the improvement and standardization of vital statistics. Doc. ST/STAT/SER.M/19. New York: United Nations. 1953. 4. National Office of Vital Statistics. Births and birth rates in the entire United States, 1909 to 1948. Vital Statistics--Special reports; vol 33 no 8. Washington: Public Health Service. 1950. 5. U.S. Bureau of the Census. Population of metropolitan areas and component geography: 1990 and 1980 (6-30-90 definitions). 1990 CPH-L-10. Washington: U.S. Department of Commerce. 1991. 6. U.S. Department of Commerce. Metropolitan statistical area classification. Federal Register; vol 45 no 2. Washington: U.S. Government Printing Office, 956-62. 1980. 7. U.S. Office of Management and Budget. Standard metropolitan statistical areas. Rev. ed. Washington: U.S. Government Printing Office, 89-90. 1975. 8. U.S. Bureau of the Census. 1990 Census of Population. General population characteristics; (1990 CP-1-1). Washington: U.S. Department of Commerce. 1992. 9. Martin, JA. Birth characteristics for Asian or Pacific Islander subgroups, 1992. Monthly vital statistics report; vol 43 no 10, suppl. Hyattsville, Maryland: National Center for Health Statistics. 1995. 10. Schachter J. Matched record comparison of birth certificate and census information in the United States, 1950. Vital statistics-- Special Reports; vol 47 no 12. Washington: Public Health Service. 1962. 11. Office of the State Registrar. Michigan Department of Public Health. Unpublished tabulation. 1995. 12. Ventura SJ. Trends and differentials in births to unmarried women, United States, 1970-76. National Center for Health Statistics. Vital Health Stat 21(36). 1980. 13. Taffel S, Johnson D, Heuser R. A method for imputing length of gestation on birth certificates. National Center for Health Statistics. Vital Health Stat 2(93). 1982. refnat94.doc - Page 1 14. Brockert JE, Stockbauer JW, Senner JW, et al. Recommended standard medical definitions for the U.S. Standard Certificate of Live Birth, 1989 revision. Paper presented at annual meeting of the Association for the Vital Record and Health Statistics. June 1990. 15. U.S. Bureau of the Census. Test of birth-registration completeness, 1964 to 1968. 1970 census of population and housing; PHC (E)-2. Washington: Evaluation and Research Program, U.S. Department of Commerce. 1973. 16. U.S. Bureau of the Census. U.S. population estimates, by age, sex, race, and Hispanic origin, 1980-91. Current Population Reports; Series P-25, no 1095. Washington: U.S. Department of Commerce. 1992. 17. U.S. Bureau of the Census. Coverage of the national population in the 1980 census by age, sex, and race. Preliminary estimates by demographic analysis. Current Population Reports; Series P-23, no 115. Washington: U.S. Department of Commerce. 1982. 18. U.S. Bureau of the Census. Estimates of coverage of the population by sex, race, and age--Demographic analysis. 1970 census of population and housing; PHC (E)-4. Evaluation and Research Program. Washington: U.S. Department of Commerce. 1974. 19. U.S. Bureau of the Census. Developmental estimates of the coverage of the population of States in the 1970 census-demographic analysis. Current Population Reports; Series P-23, no 65. Washington: U.S. Department of Commerce. 1977. 20. Robinson JG, Ahmed B, Das Gupta P, et al. Estimation of Population Coverage in the 1990 United States Census Based on Demographic Analysis. JASA 88(423):1061-71. 1993. 21. Heuser R. Fertility tables for birth cohorts by color: United States, 1917-73. Washington: National Center for Health Statistics. 1976. 22. Barclay GW. Techniques of population analysis. New York: John Wiley & Sons, Inc., 216-22. 1958. 23. U.S. Bureau of the Census. The X-11 variant of the Census Method II Seasonal Adjustment Program. Technical paper; no 15, 1967 rev. Washington: U.S. Department of Commerce. 1967. refnat94.doc - Page 2