Columbia subject headings:
Marine mineral resources--Economic aspects.
Mineral industries--Economic aspects.
Mineral industries.
Mineral resources in submerged lands--Economic aspects.
Harvard subject headings:
Marine mineral resources--Economic aspects.
Mineral industries
Mineral resources in submerged lands--Economic aspects.
Princeton subject headings:
Marine mineral resources--Economic aspects.
Mineral industries.
Mineral resources in submerged lands--Economic aspects.