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International Directory of Mental Retardation Resources
United States. President's Committee on Mental Retardation
出版U.S. Department of Health, Education, and Welfare, President's Committee on Mental Retardation, 1978
ISBN01232764549780123276452
URLhttp://books.google.com.hk/books?id=oL1cF0QnL4QC&hl=&source=gbs_api