331.7 Labor by industry and occupation
331.71 Professional occupations
331.7108 Minority professional employees 331.710973 Professional workers--United States de
331.7 Arbeit nach Industrie und Beruf
331.71 Freiberufliche Tätigkeiten
331.710973 Freiberufliche Arbeitskräfte—USA, . . .
Dewey Decimal Classification
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