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Retna: Mar 1921. 
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EDITED BY 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
STUART WELLER : ALBERT JOHANNSEN ~ 
5 Invertebrate Paleonteloey : Petrology 
EDSON S. BASTIN ROLLIN T. CHAMBERLIN % =f 
Economic Geology : Dynamic Geology ea 
The Journal of Geology is : published hy the win dieity of Chicago at the University of chaser P: 
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Entered as second-class matter, March 20, 1893, at the Post-office at Chicago, Ill., under the Act of March 3, 1879. r ‘ ay 
Acceptance for mailing at special rate of postage provided for in Section 1103, Act of October ‘ae x917, authorized © 
July 5, 1918. ; By Sa 
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