Bulletin No. 269 Series A, Economic Geology, 61 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES I). WALCOTT, DiKECTOK 
CORUNDUM 
ITS OCCURRENCE AND DISTRIBUTION 
IN THE UNITED STATES 
(A REVISED AND ENLARGED EDITION OF BULLETIN NO. 180) 
BY 
JOSET^H HYDE PRATT 
0. 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1 9 6 
