Coal miners History 32 Coal mines and mining 18 Labor unions 11 Social conditions 9 Social aspects 7 Working class 5 more ... Coal trade 4 Immigrants 4 Labor movement 4 Social life and customs 4 Strikes and lockouts 4 Child labor 3 Coal mining 3 Economic conditions 3 Ethnic relations 3 Labor disputes 3 Welsh Americans 3 Anthracite coal industry 2 Coal 2 Coal Strike, Colo., 1913-1914 2 Cultural assimilation 2 Environmental aspects 2 Family 2 Fathers and sons 2 Labor 2 Organizing 2 Travel 2 Women labor leaders 2 Women social reformers 2 less ...