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Working with Older People: Biological, psychological and sociological aspects of aging

出版	U.S. Department of Health, Education, and Welfare, Public Health Service, Division of Chronic Diseases, Gerontology Branch, 1966
URL	http://books.google.com.hk/books?id=TjBsAAAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN