October-N ovember 1918 
EDITED BY 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
*SAMUEL W. WILLISTON ALBERT JOHANNSEN 
Vertebrate Paleontology Petrology 
STUART WELLER ae ROLLIN T. CHAMBERLIN 
Invertebrate Balenarolene 3 Dynamic Geology 
ALBERT D. BROKAW 
*Deceased. 3 3 Economic Geology 
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