Columbia subject headings:
Coal trade--Spain--Asturias--History--19th century.
Industries--Spain--Asturias--History.
Iron industry and trade--Spain--Asturias--History--19th century.
Steel industry and trade--Spain--Asturias--History--19th century.
Harvard subject headings:
Industries--Spain--Asturias--History.
Princeton subject headings:
Asturias (Spain)--Economic conditions.
Industries--Spain--Asturias--History.