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Occupation according to the 1980 Standard occupational classification
(1994)
Standard occupational classification manual : based on information from the US Office of Management and Budget
(2002)
New methods for job and occupation classification
Schierholz, Malte, (2019)
1991 census dictionary
(1992)
Juvenile court statistics : 1982 and 1983
(1985)
Small business in Canada : 1981 - 1983
(1986)