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Administration of Child Labor Laws
United States. Children's Bureau
Helen Laura Sumner
Ethel Edna Hanks
Francis Henry Bird
Ella Arvilla Merritt
出版
U.S. Government Printing Office
, 1915
URL
http://books.google.com.hk/books?id=uCE5AQAAMAAJ&hl=&source=gbs_api
EBook
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