Columbia subject headings:
Metal trade--Statistics.
Metal trade--United States--Statistics.
Nonferrous metals--Statistics.
Nonferrous metals--United States--Statistics.
Harvard subject headings:
Metal trade--Statistics.
Metal trade--United States--Statistics.
Nonferrous metals--Statistics.
Nonferrous metals--United States--Statistics.
Princeton subject headings:
Metal trade--Statistics--Periodicals.
Metal trade--United States--Statistics--Periodicals.
Nonferrous metals--Statistics--Periodicals.
Nonferrous metals--United States--Statistics--Periodicals.