Investigation of possible effects of surface coal mining on hydrology and landscape stability in part of the Powder River structural basin, northeastern Wyoming

Strip mining -- Environmental aspects -- Powder River Watershed (Wyo. and Mont.) Coal mines and mining -- Environmental aspects -- Powder River Watershed (Wyo. and Mont.) Water -- Pollution -- Powder River Watershed (Wyo. and Mont.) Formations (Geology) -- Powder River Watershed (Wyo. and Mont.)