Bulletin No. 275 
Series A, Economic Geology, 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT. Director 
SLATE DEPOSITS AND SLATE INDUSTRY 
OE THE UNITED STATES 
T. NELSON DALE 
WITH SECTIONS BY 
E. C. ECKEL, W. F. HILLEBRAND, AND A. T. COONS 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
19 6 
