Guidebook to the geology about Pittsburgh Leighton, Henry 1884- creator text bibliography pau Harrisburg, Pa Department of internal affairs, Topographic and geologic survey 1939 monographic eng
print
35 p. illus., map, tables. 23 cm. by Henry Leighton. At head of title: Pennsylvania Geological survey, Fourth series. On cover: Commonwealth of Pennsylvania. Department of internal affairs. "Selected bibliography": p. 34-35. Pittsburgh (Pa.) Guidebooks Geology Pennsylvania Pittsburgh Region QE158.P55 L42 Bulletin G, 17 gs 39000361 U.S. Geol. Survey. Library 780817 20260227111345.0 gs 39000361