Columbia subject headings:
Natural resources--Law and legislation--United States--History.
Public use--United States--History.
Trade regulation--United States--History.
United States--Economic policy--To 1933.
Harvard subject headings:
Natural resources--Law and legislation--United States--History.
Public use--United States--History.
Trade regulation--United States--History.
United States--Economic policy--To 1933.
Princeton subject headings:
Natural resources--Law and legislation--United States--History.
Public use--United States--History.
Trade regulation--United States--History.
United States--Economic policy--To 1933.