Bulletin  No.  225 
Series  A,  Economic 
33 
DEPARTMENT  OF  THE  INTERIOR 
CHARLES  D.  WALCOTT.  Director 
CONTRIBUTIONS 
TO 
ECONOMIC   GEOLOGY 
19  03 
S.   F.   EMMONS 
C.   W.   HAYES 
Greologists  in.  Charge 
WASHINGTON 
GOVERNMENT     PRINTING     OFFICE 
1904 
