Guidebook to the geology about Pittsburgh - Leighton, Henry, 1884- (Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939)
At head of title: Pennsylvania Geological survey, Fourth series.
On cover: Commonwealth of Pennsylvania. Department of internal affairs.
"Selected bibliography": p. 34-35.
Keywords: Pittsburgh (Pa.) -- Guidebooks; Geology -- Pennsylvania -- Pittsburgh Region