Columbia subject headings:
Founding--Japan--History--19th century.
Iron industry and trade--Japan--History--19th century.
Ordnance--Japan--Manufacture--History--19th century.
Steel industry and trade--Japan--History--19th century.
Harvard subject headings:
Artillery--Japan--History.
Iron industry and trade--Japan--History
Steel industry and trade--Japan--History.
Princeton subject headings:
Artillery--Japan--History.
Iron industry and trade--Japan--History.
Steel industry and trade--Japan--History.