Butler, G. M.  1881- <br/><br/>
Petroleum, 
by G. M. Butler and M. A. Allen ... 
 - Tucson, Ariz.,  University of Arizona, Bureau of Mines,  1921. 
 - Cover-title, 45 p. 
 - Arizona. State Bureau of Mines. Bulletin,  no. 116. Oil series, no. 4 .
 - University of Arizona.  State Bureau of Mines.  Bulletin. University of Arizona.  Bulletin ;  v. 2, no. 1. .
<br/><br/> At head of title: ... University of Arizona bulletin. 
<br/><br/>"Selected bibliography": p. 44-45. 
<br/><br/><label>LCCN: </label>gs 22000062  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum--Geology.
<br/><br/><label>LC Class. No.: </label>TN1  / .A65 no. 4, 1921 
<br/><br/><label>Gov. Doc. Class. No.: </label>MN 1.3:B 85/116