Child labor : outlines for study
著者
書誌事項
Child labor : outlines for study
(Bureau publication / U.S. Department of Labor, Children's Bureau, no. 93 (rev. ed.))
Government Printing Office, 1923
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注記
"Separate no. 4, child care and child welfare, prepared by the Children's Bureau, United States Department of Labor, in cooperation with the Federal Board for Vocational Education"