Columbia subject headings:
Europe--Commerce.
Japan--Commerce.
Mineral industries.
Petroleum industry and trade.
Security, International.
Strategic materials.
Trade routes.
Harvard subject headings:
Europe--Commerce.
Japan--Commerce.
Mineral industries
Petroleum industry and trade.
Security, International.
Strategic materials
Trade routes.
Princeton subject headings:
Europe--Commerce.
Japan--Commerce.
Mineral industries.
Petroleum industry and trade.
Security, International.
Strategic materials.
Trade routes.