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Vital and health statistics - Series 21 - Data from the National Vital Statistics System / National Center for Health Statistics, United States.-- (1964) -  (1974) -.-- Washington ISSN 0083-2030   Texto Completo Gratuito - Livre acesso URL http://www.cdc.gov/nchs/products/pubs/pubd/series/sr21/ser21.htm