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Employment, Hours, and Earnings, United States

出版	U.S. Department of Labor, Bureau of Labor Statistics, 1979
URL	http://books.google.com.hk/books?id=MBQmUMNYZ0sC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋Vols. for 1909/72- contain data on job vacancies.