Hager, Dorsey,  1857- <br/><br/>
Practical oil geology / 
by Dorsey Hager. 
 - 5th ed. 
 - New York,  McGraw-Hill book company, inc.,  1938 
 - xii, 149 p.  illus., tables, diagrs.  19 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOLOGIA<br/>PETROLEO
<br/><br/><label>Universal Decimal Class. No.: </label>55