EDITED BY 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY. eo , 
" With the more Collaboration of saa Tie 
SAMUEL W. WILLISTON f ALBERT JOHANNSEN 
Vertebrate Paleontology ; * Petrology si ae i ean ian 
. a oe eo 4 ae 7 
STUART WELLER ROLLIN re CHAMBERLIN seat ahs ans ap ee 
Invertebrate Paleontology — : os Dynamic Genleey sf ahoateaealiniad 
ALBERT D. BROKAW 
Economic Geology 
we 
\ 
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