Columbia subject headings:
Nonferrous metal industries--Europe--Statistics--Periodicals.
Nonferrous metal industries--Japan--Statistics--Periodicals.
Nonferrous metal industries--North America--Statistics--Periodicals.
Harvard subject headings:
Nonferrous metal industries--Europe--Statistics.
Nonferrous metal industries--Japan--Statistics.
Nonferrous metal industries--North America--Statistics.
Princeton subject headings:
Nonferrous metal industries--Europe.