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Child Labor Legislation in the United States
Helen Laura Sumner
United States. Children's Bureau
Ella Arvilla Merritt
其他書名
Separate No. 1[-54].
出版
U.S. Government Printing Office
, 1915
URL
http://books.google.com.hk/books?id=2yW7AAAAIAAJ&hl=&source=gbs_api
EBook
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