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Dictionary of Occupational Titles

出版	U.S. Government Printing Office, 1991
URL	http://books.google.com.hk/books?id=D5RqAAAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Supplement to 3d ed. called Selected characteristics of occupations (physical demands, working conditions, training time) issued by Bureau of Employment Security.