Columbia subject headings:
Commercial products--United States--Periodicals--Indexes.
Corporations--United States--Periodicals--Indexes.
Industries--United States--Periodicals--Indexes.
Harvard subject headings:
Commercial products--United States--Periodicals--Indexes--Periodicals.
Corporations--United States--Periodicals--Indexes--Periodicals.
Industries--United States--Periodicals--Indexes--Periodicals.
Princeton subject headings: