Report of Progress ...
Publisher: Pub. by the Board of Commissioners for the Second Geological Survey
Published: 1891
Number of pages: 456
Notes: "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.