Geology and mineral deposits of the Venezuelan Guayana Shield / 
edited by Gary B. Sidder, Andres E. Garcia, and Judith W. Stoeser 
 - Washington:  U.S. G.P.O.,  1995 
 - 1 v. (various pagings) :  ill. ;  28 cm. 
 - U.S Geological Survey Bulletin ;  no. 2124 .
<br/><br/>Includes bibliographical refrences