Meyer, Richard F.  1921- <br/><br/>
Definition and world resources of natural bitumens / 
by Richard F. Meyer and Wallace De Witt. 
 - [Washington]:   [United States Government Printing Office],   [1990].  
 - iv, 14 p. :  tables ;  28 cm. 
 -  1944 .
<br/><br/>Includes bibliographical references (p. 13-14). 
<br/><br/> Definitions of the main types of natural bitumens, with emphasis on natural asphalt, the most significant quantitatively and economically, and its world distribution. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bitumen<br/>Asphalt
<br/><br/><label>Dewey Class. No.: </label>553.24