Report of progress 1874-1889, A-Z ..
35 vols. are atlases Several volumes have no general title J. Peter Lesley, state geologist A list of these reports with index may be found in the appendix to "A general index of the Final summary report of the geology of Pennsylvanis." 1895 "Appendix A to Report of progress R (not listed in above index) was issued in 1881 with title: Drillings for coal in Sergeant township, McKean County. A correspondence by N. F. Jones, J. P. Lesley, and Chas A. Ashburner
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