United States. Children's Bureau
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Comparability of Maternal Mortality Rates in the United States and Certain Foreign Countries : A Study of the Effects of Variations in Assignment Procedures, Definitions of Live Births, and Completeness of Birth Registration, Bureau Publication No. 229 ,
Washington, D.C:
Government Printing Office,
1935, https://fraser.stlouisfed.org/title/8505,
accessed on February 5, 2026.