Columbia subject headings:
Japan--Relations--Korea.
Kaya (Confederation)--Historiography.
Korea--Relations--Japan.
Metal-work--Korea--History.
Metallurgy--Korea--History.
Harvard subject headings:
Iron industry and trade--Paekche (Kingdom)--History.
Iron mines and mining--Korea--History.
Paekche (Kingdom)--Foreign economic relations.
Princeton subject headings:
Japan--Relations--Korea.
Kaya (Confederation)--Historiography.
Korea--Relations--Japan.
Metal-work--Korea--History.
Metallurgy--Korea--History.