A social study of mental defectives in New Castle County, Delaware
著者
書誌事項
A social study of mental defectives in New Castle County, Delaware
（Dependent, defective, and delinquent classes series, no. 3）（Bureau publication / U.S. Department of Labor, Children's Bureau, no. 24）
G.P.O., 1917
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注記
At head of title: U.S. Department of Labor, Children's Bureau
"This study was made under the direction of Miss Emma O. Lundberg, who prepared the report with the assistance of Miss Katharine F. Lenroot"--P. 5
