Columbia subject headings:
Land use--West (U.S.)
Natural resources--West (U.S.)
Water resources development--West (U.S.)
Harvard subject headings:
Land use--West (U.S.)
Natural resources--West (U.S.)
Water resources development--West (U.S.)
Princeton subject headings:
Land use--West (U.S.).
Natural resources--West (U.S.).
Water resources development--West (U.S.)