X 



BULL. GEOL. SOC. AM., VOL. 3. 



* Bearing the imprint ["From Bull. Geul. Soc. Am., Vol. 3, 1891'*]. 

 f Fractional pages sometimes included. 

 X Pages 56-59 inclosed in same cover. 

 i With pages 3-13 and frontispiece. 



