56 BULLETIN 102, VOL. 1, UNITED STATES NATIONAL MUSEUM. 



I 



APPALACHIAN 



UNA- INDIANA 



ILLINOIS 



KAN5A5-OKLAH0MA 

 KORTH TEXAS 



noniHYi EST Lou\s)M^ 

 euur COAST 



ROCKY MOUNTAIN 



CALtFORNIA 



Pig. 8. — ^Thb relative output of the principal oil fields of the United States from 1900 

 THROUGH 1917. Note the dominant positions held bt the Kansas-Oklahoma and Cali- 



BH)BNIA fields. DaTA FROM U. S. GEOLOGICAL SURVEY. 



