Columbia subject headings:
Harvard subject headings:
Chūgoku Region (Japan)--Antiquities.
Iron industry and trade--Japan--Chūgoku Region--History.
Steel industry and trade--Japan--Chūgoku Region--History.
Princeton subject headings:
Chūgoku Region (Japan)--Antiquities.
Iron industry and trade--Japan--Chūgoku Region--History.
Steel industry and trade--Japan--Chūgoku Region--History.