U.S. 
DEPARTMENT OF THE 
INTERIOR 
 MINERALS YEARBOOK 
 
 
 
 
MINERALS IN THE 
WORLD ECONOMY 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
BUREAU OF 
MINES 
 
 
 
 
 
 
 
 
 
 
1989 
  UWMADISON 
 WENDT LIBRARY 
II  ttIAR1t~gg3 
~ DEPOSITO~, COpy DO NOT