Columbia subject headings:
Harvard subject headings:
Black Country (England)--Economic conditions.
Borinage (Belgium)--Economic conditions.
Coal mines and mining--Belgium--Borinage--History.
Coal mines and mining--England--Black Country--History.
Industrialization--Belgium--Borinage--History.
Industrialization--England--Black Country--History.
Iron industry and trade--Belgium--Borinage--History.
Iron industry and trade--England--Black Country--History.
Princeton subject headings:
Black Country (England)--Economic conditions.
Borinage (Belgium)--Economic conditions.
Coal mines and mining--Belgium--Borinage--History.
Coal mines and mining--England--Black Country--History.
Industrialization--Belgium--Borinage--History.
Industrialization--England--Black Country--History.
Iron industry and trade--Belgium--Borinage--History.
Iron industry and trade--England--Black Country--History.