Infant mortality in Pittsburgh : an analysis of records for 1920 with six charts
著者
書誌事項
Infant mortality in Pittsburgh : an analysis of records for 1920 with six charts
(Infant mortality series, no.12)(Bureau publication / U.S. Department of Labor, Children's Bureau, no.86)
Government Printing Office, 1921
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注記
At head of title: U.S. Department of Labor, Children's Bureau