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

by Glover, Albert D., Bragonier, William A.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1978

Geology and mineral resources of the Sabula and Penfield quadrangles, Clearfield, Elk, and Jefferson Counties, Pennsylvania /

by Berg, Thomas M., Glover, Albert D.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1976

Geology and mineral resources of the Philipsburg 7 1/2-minute quadrangle, Pennsylvania /

by Glass, Gary B.
Harrisburg : [Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey], 1974