Columbia subject headings:
Exports--United States--States--Statistics.
Exports--United States--Statistics.
Manufacturing industries--United States--Statistics.
United States--Commerce--Statistics.
Harvard subject headings:
Exports--United States--States--Statistics.
Exports--United States--Statistics
Manufactures--United States--Statistics
Manufacturing industries--United States--Statistics.
United States--Commerce--Statistics.
Princeton subject headings:
Exports--United States--States--Statistics.
Exports--United States--Statistics.
Manufactures--United States--Statistics.
Statistics.
United States--Commerce--Statistics.