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 Surveys.
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[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by Map Distribution, 1993.