Columbia subject headings:
Coal miners--Labor unions--England--Durham (County)
Coal miners--Political activity--England--Durham (County)
Durham Miners' Association--History.
Harvard subject headings:
Coal miners--England--Durham (County)--Political activity--History.
Coal miners--Labor unions--England--Durham (County)--History.
Coal miners--Political activity--England--Durham (County)--History.
Durham Miners' Association--History.
Social classes--England--Durham (County)--History.
Princeton subject headings:
Coal miners--England--Durham (County)--Political activity--History.
Coal miners--Labor unions--England--Durham (County)--History.
Durham Miners' Association--History.
Social classes--England--Durham (County)--History.