VOL,. IV 
PL. XX 
miLLumnAL smm 
(DAIR1B 'OHDIPB M ©ID S 
^ Coal Measures 
W<ID6SJm« 1K1L»0))IR<A. 
Leo Lesquereux del. 
A.H-Worthen dirext. 
Western Engraving Go. Chicago. 
