Subsurface geologic methods :  a symposium / 
Edited by L. W. Leroy. 
 - 2nd Ed. 
 - Colorado :  Colorado school of mines,  c 1950. 
 - 1156 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>319  319 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Research.
<br/><br/><label>Dewey Class. No.: </label>551 / L562s