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Child Development: Day Care: Family day care, edited by C. Seefeldt and L. Dittmann. (no. (OHD) 73-1054)

United States. Office of Child Development

出版	U.S. Government Printing Office, 1971
URL	http://books.google.com.hk/books?id=WfqizgEACAAJ&hl=&source=gbs_api