http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
legitimate live births, United States - 1963
National Center for Health Statistics (U.S.)
"Statistics on the prevalence of employment during pregnancy and the trimester of pregnancy during which the woman was last emplcyed, according to selected socioeconomic characteristics of the mother. Based on data collected by a questionnaire mailed to a sample of mothers selected from the certificates of legitimate live births in 1963 filed with the National Center for Health Statistics."
Includes bibliographical references (page 10).
Public Health Service publication ; no. 1000
Data from the national vital statistics system