L 77 
n n >■ xt am ■ o, •,.„ f A, Economic Geology, 54 
W*» No. 261 Series j g | Chemistry and g^ 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT, Directok 
45 
PRELIMINARY REPORT 
ON THE OPERATIONS OF THE 
COAL-TESTING PLANT 
UNITED STATES GEOLOGICAL SURVEY 
LOUISIANA PURCHASE EXPOSITION, ST. LOUIS, MO., 1904 
EDWARD W. PARKER, JOSEPH A. HOLMES, MARIUS R. CAMPBELL 
CO?IMXTTEE IN CHARGE 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
19 05 
