DEPARTMENT  OF  THE  INTERIOR 
UNITED   STATES  GEOLOGICAL  SURVEY 
GEORGE  OTIS  SMITH,  Director 
Bulletin  341 
CONTRIBUTIONS 
TO 
ECONOMIC    GEOLOGY 
1907 
AET  IL-COAL  AND 
lignit: 
PBELL 
ARGE 
MARIUS  R.  CAM 
GEOLOGIST   IN   CH 
V 
M 
WASHINGTON 
GOVERNMENT     PRINTING    OFFICE 
1909 
