Columbia subject headings:
Industrial policy--United States.
Iron industry and trade--Law and legislation--United States.
Steel industry and trade--Law and legislation--United States.
Harvard subject headings:
Iron industry and trade--Law and legislation--United States.
Steel industry and trade--Law and legislation--United States.
Princeton subject headings:
Iron industry and trade--Law and legislation--United States.
Steel industry and trade--Law and legislation--United States.