Columbia subject headings:
Copper industry and trade--Japan.
Copper mines and mining--Japan.
Merchants--Japan--Osaka--History.
Osaka (Japan)--Commerce--History.
Harvard subject headings:
Copper industry and trade--Japan.
Copper mines and mining--Japan.
Merchants--Japan--Osaka--History.
Osaka (Japan)--Commerce--History.
Princeton subject headings:
Copper industry and trade--Japan.
Copper mines and mining--Japan.
Merchants--Japan--Osaka--History.
Osaka (Japan)--Commerce--History.