Infant mortality : results of a field study in Brockton, Mass. based on births in one year
著者
書誌事項
Infant mortality : results of a field study in Brockton, Mass. based on births in one year
（Infant mortality series, no. 8）（Bureau publication / U.S. Department of Labor, Children's Bureau, no. 37）
G.P.O., 1919
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注記
At head of title: U.S. Department of Labor, Children's Bureau
