Výsledky vyhľadávania - "Pennsylvania Geological Survey"

Geology and mineral resources of the Ramey and Houtzdale quadrangles, Clearfield and Centre counties, Pennsylvania /

Glass, Gary B.
Pennsylvania Geological Survey, 1977

Geology and groundwater resources of northern Berks County, Pennsylvania /

Wood, Charles R., MacLachlan, David B.
Pennsylvania Geological Survey, 1978

Geology and mineral resources of the Hazen, Falls Creek, Reynoldsville, and Dubois quadrangles, Clearfield and Jefferson Counties, Pennsylvania /

Glover, Albert D., Bragonier, William A.
Pennsylvania Geological Survey, 1978