Wrigley, Henry E. <br/><br/>
Special report on the petroleum of Pennsylvania,  its production, transportation, manufacture and statistics. 
By Henry E. Wrigley ... To which are added a map and profile of a line of levels through Butler, Armstrong and Clarion counties.  By D. Jones Jucas.  And also a map and a profile of line of levels along Slippery Rock creek.  By J. P. Lesley. 
 - Harrisburg,  Pub. by the Board of Commissioners for the Second Geological Survey,  1875. 
 - vii, 122J p.  fold. plates, fold. maps, diagrs. (1 fold.)  23 cm. 
 - Pennsylvania. Geological Survey, 2d. Report of progress  J .
 - Report of progress (Geological Survey of Pennsylvania),  J. .
<br/><br/> At head of title: Second Geological Survey of Pennsylvania, 1874. 
<br/><br/><label>LCCN: </label>gs 07000736  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>QE157  / .A16 vol. 42