Meyer, R. F.  1921- <br/><br/>
Definition and world resources of natural bitumen / 
by Richard F. Meyer and Wallace De Witt 
 - Washington, D. C. :  Government Printing Office,  1990 
 - 14 p. :  ill. ;  24 cm. 
 - U.S. Geological survey bulletin,  1944 .
<br/><br/><label>LCCN: </label>90-003856 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bitumen<br/>Asphalt