Geology of the New Tripoli quadrangle, Lehigh, Berks, Schuylkill, and Carbon counties, Pennsylvania / by Jack B. Epstein and Peter T. Lyttle ; prepared in cooperation with the Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey.
Publication Info.
[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1993.
[Washington, D.C.] : United States Government Printing Office