Columbia subject headings:
Cattle trade--Social aspects--West (U.S.)
Coal trade--Social aspects--West (U.S.)
Economic development projects--Social aspects--West (U.S.)
Natural resources--West (U.S.)
Harvard subject headings:
Cattle trade--Social aspects--West (U.S.)
Coal trade--Social aspects--West (U.S.)
Economic development projects--Social aspects--West (U.S.)
Natural resources--West (U.S.)
Princeton subject headings:
Cattle trade--Social aspects--West (U.S.).
Coal trade--Social aspects--West (U.S.).
Economic development projects--Social aspects--West (U.S.).
Natural resources--West (U.S.).