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A Six-year Program Adapted Both to the 6-3-3 and the 8-4 Plans of Organization : Report of the Committee on Social Studies of the Commission on the Reorganization of Secondary Education of the National Education Association
出版U.S. Government Printing Office, 1916
URLhttp://books.google.com.hk/books?id=DkIXAQAAIAAJ&hl=&source=gbs_api
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