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Child Labor Legislation in the United States, by Helen L. Sumner and Ella A. Merritt ...

Ella Arvilla MerrittHelen Laura Sumner Woodbury (Mme Robert Morse)

出版	U.S. Government Printing Office, 1915
URL	http://books.google.com.hk/books?id=2aWVXwAACAAJ&hl=&source=gbs_api