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- Working class19,935
- Labor6,161
- Labor movement5,882
- History4,625
- Labor unions1,974
- Social conditions1,971
- Economic conditions1,665
- Political activity1,562
- Politics and government1,111
- Socialism1,075
- Education703
- Dwellings634
- Labor laws and legislation520
- Industries499
- Wages487
- Housing480
- Industrial relations465
- Poor452
- Communism418
- Labor supply392