Columbia subject headings:
Harvard subject headings:
Coal mines and mining--Environmental aspects--West (U.S.)
Reclamation of land--West (U.S.)
Strip mining--Environmental aspects--West (U.S.)
Princeton subject headings:
Coal mines and mining--Environmental aspects--West (U.S.).
Reclamation of land--West (U.S.).
Strip mining--Environmental aspects--West (U.S.).