Root, Towner Bowditch,  1899- <br/><br/>
The oil and gas resources of the Ava-Campbell Hill area, 
by Towner B. Root. 
 - Urbana, Ill.,  Printed by authority of the state of Illinois,  1928. 
 - 27 p.  illus. 
<br/><br/> At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey. 
<br/><br/><label>LCCN: </label>gs 28000208  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum--Illinois, Southwestern.<br/>Natural gas--Illinois, Southwestern.
<br/><br/><label>LC Class. No.: </label>TN872.I3  / R6