Magnetite in Pennsylvania /

by Corbin, J. Ross
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geological Survey, 1923

Research into the prehistoric jasper quarries of Bucks, Lehigh and Berks counties, Pennsylvania /

by Hatch, James W.
[Harrisburg : the Commission], 1993

Map of the Reading Prong, Eastern Pennsylvania, showing the locations of generalized gamma-ray anomalies detected by carbone survey

[Harrisburg?] : Commonwealth of Pennsylvania, Department of Environmental Resources, Topographic and Geologic Survey, 1985

Alburtis quadrangle, Pennsylvania [and] Allentown quadrangle, Pennsylvania /

Reston, Va. : Denver, Colo. : U.S. Geological Survey ; For sale by the Survey, 1957

Church records