Infant mortality : results of a field study in Johnstown, Pa., based on births in one calendar year
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書誌事項
Infant mortality : results of a field study in Johnstown, Pa., based on births in one calendar year
（Infant mortality series, no. 3）（Bureau publication / U.S. Department of Labor, Children's Bureau, no. 9）
Government Printing Office, 1915
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注記
At head of title: U.S. Department of Labor, Children's Bureau