A preliminary report on the palaeontology of Perry county, describing the order and thickness of its formations and its folded and faulted structure. - Claypole, E. W. (Edward Waller), 1835-1901. (Harrisburg, Pub. by the Board of commissioners for the Second geological survey, 1885)
On cover: Pennsylvania. Second geological survey, Perry county. Part I. Geology.
Keywords: Paleontology -- Pennsylvania -- Perry County; Geology -- Pennsylvania -- Perry County