"VOL. IV 
(DAIPtlB <D)^n IP'OHJ IFt (DTD'S 
wsawwmk ui? 
| Coal Measuresj 
PL. XXVll 
IK'flD Sf3JDC. IF lit flPTHLA 
Western-Engraving Co-Chicago. 
A.H.Worthen dirext. 
