Other
Labor unions
Social conditions
History
9
Labor movement
4
Coal miners
3
Coal mines and mining
3
Railroads
3
Employees
2
Ethnology
2
Strikes and lockouts
2
Accidents
1
African Americans
1
Afro-American membership
1
Biography
1
Brass industry and trade
1
Brass industry employees
1
Economic conditions
1
Emigration and immigration
1
Employment
1
Interviews
1
Iron and steel workers
1
Labor
1
Labor and laboring classes
1
Mexican Americans
1
Minority membership
1
Textile workers
1
Working class
1