28 
BULLETIN 102, UNITED STATES NATIONAL MUSEUM. 
YEARS 
1910 
APPALACHIAN 
LIMA-INDIANA 
ILLINOIS 
KANSAS-OKLAKOMA 
WORTH TEXAS 
A0RTHWE5T LOUISIANA 
GULF COAST 
ROCKY MOUNTAIN 
CALIFORNIA 
Fig. 7. — The relative output of the principal oil fields of the United States from 1900 
through 1917. Note the dominant positions held by the Kansas-Oklahoma and Cali- 
fornia fields. Data from U. S. Geological Survey. 
