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Lesley, J Peter

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The Geology of Huntingdon County, Volume 59
The Geology of Chester County: After the Surveys of Henry D. Rogers, Persifor Frazer, and Charles E. Hall, Volume 9
Final Report Ordered by Legislature, 1891: Upper Silurian and Devonian Formations, by J.P. Lesley
A Geological Hand Atlas of the Sixty-Seven Counties of Pennsylvania: Embodying the Results of the Field Work of the Survey, from 1874 to 1884, Volume 63