Dictionary of occupational titles. - United States Employment Service (Washington, D. C. U. S. Dept. of Labor, Employment and Training Administration, for sale by the Superintendent of Document, 1977)
"Supersedes the 1949 edition of vols. I and II and its supplement of Mar 1955, and pt. IV of Oct. 1944."
Keywords: Occupations -- Terminology; Occupations -- Classification