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Industrial Series, No. 1[-7]: (Bureau publication, no. 10) Child labor legislation in the United States. Federal. September 1916. 1916. HD6243.U5A4 1916
United States. Children's Bureau
出版U.S. Government Printing Office, 1915
URLhttp://books.google.com.hk/books?id=0wtFAQAAMAAJ&hl=&source=gbs_api
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