PAPERS ON GEOGRAPHY AND GEOLOGY 



373 



IS 1 JO J' 



Fig. 1. Diagram showing rise and decline of oil production in Illinois, 1905- 

 1918, expressed in barrels of 42 gallons.a 



A. Total for State. D. Clark County Pool. G. Plymouth Pool. 



B. Crawford County Pool. E. Sandoval Pool. 



C. Lawrence County Pool. F. Carlyle Tool. 



a Statistics on oil production for individual pools are not available after 1918. 



