Columbia subject headings:
United States--Commerce.
United States--Commercial policy.
World War, 1939-1945--Economic aspects--United States.
Harvard subject headings:
United States--Commerce.
United States--Commercial policy.
World War, 1939-1945--Economic aspects--United States.
Princeton subject headings:
United States--Commerce.
United States--Commercial policy.
World War, 1939-1945--Economic aspects--United States.