http://dewey.info/scheme/e22/
330
Economics
331
Labor economics
http://dewey.info/scheme/a14/
331
Labor economics
331.01
Philosophy and theory
331.1
Labor force and market
331.2
Conditions of employment
331.3
Workers by age group
331.4
Women workers
331.5
Special categories of workers other than by age or sex
331.6
Categories of workers by ethnic and national origin
331.7
Labor by industry and occupation
331.8
Labor unions, labor-management bargaining and disputes
Dewey Decimal Classification
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