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1.

図書
図書
1. Job descriptions for the bakery products industry
Prepared by the Job analysis and information section, Division of standards and research. June, 1939. United States Department of labor, Frances Perkins, secretary. United States Employment service, William H. Stead, chief executive officer.
出版情報: Washington : U.S. Govt. Print. Off.
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2.

図書
図書
2. Job descriptions for domestic service and personal service occupations
United States Department of Labor, United States Employment Service ; prepared by the Job Analysis and Information Section, Division of Standards and Research
出版情報: Washington : United States Government Printing Office, [1939]
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