EDITED BY 1m : a ee 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the ete Collaboration of , ; 
STUART WELLER : reilh ALBERT plo SEN ete 
Invertebrate Paleontology ; Se Petrology 
EDSON S. BASTIN ; eee a a ROLLIN T. CHAMBERLAIN — ! 
Economic Geology 
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