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Administration of Child Labor Laws
Helen Laura SumnerEthel Edna Hanks
其他書名
By Helen L. Sumner and Ethel E. Hanks. Part 2. Employment-certificate system, New York
出版U.S. Government Printing Office, 1917
URLhttp://books.google.com.hk/books?id=We2ma6JKypAC&hl=&source=gbs_api
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