Carll, John F.  1828-1904. <br/><br/>
Report of progress in the Venango county district / 
by John F. Carll. Observations on the geology around Warren / by F.A. Randall. Note on the comparative geology of northeastern Ohio and northwestern Pennsylvania and western New York / by J.P. Lesley. 
 - Harrisburg :  Published by the Board of Commissioners for the Second Geological Survey,  1875. 
 - 127 p. :  ill., maps (some fold.) ;  23 cm. 
 - Report of Progress / Geological Survey of Pennsylvania ;  I .
 - Report of progress (Geological Survey of Pennsylvania) ;  I. .
<br/><br/> Includes index.  At head of title: Second Geological Survey of Pennsylvania: 1874. 
<br/><br/><label>LCCN: </label>gs 07000731  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Pennsylvania--Venango County.<br/>Petroleum--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>QE157  / .A16 vol. I