Columbia subject headings:
Harvard subject headings:
Copper industry and trade--Japan--Niihama-machi Region--History.
Niihama-machi Region (Japan)--Economic conditions.
Sumitomo Besshi Kōzan Kabushiki Kaisha--History.
Princeton subject headings:
Copper industry and trade--Japan--Niihama-machi Region--History.
Niihama-machi Region (Japan)--Economic conditions.
Sumitomo Besshi Kōzan Kabushiki Kaisha--History.