Report of progress 1874-1889, A-Z. 

 - Harrisburg,  Board of Commissioners for the Second Geological Survey,  1875-91. 
 - 109 v.  illus., plates (part fold.) maps (part fold.) fold. plans, fold. tables, diagrs.  22-24 cm. 
<br/><br/> 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 Pennsylvania," 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. 
<br/><br/><label>LCCN: </label>gs 07000693  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Pennsylvania.<br/>Coal--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>QE157  / .A16