Bulletin No. 275 Series A, Economic Geology, 63 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT, Director 
SLATE DEPOSITS AND SLATE INDUSTRY 
OF THE UNITED STATES 
T. NELSON PALE 
WITH SECTIONS BY 
E. C. ECKEL, W. F. HILLEBRAND, AND A. T. COONS 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
19 6 
