John R. Hayes, a native of Colorado, re- 

 ceived a Geological Engineering (Geophysics) 

 degree from the Colorado School of Mines in 

 1934. He was employed by Humble Oil and 

 Refining Company in geophysics from 1934 

 to 1940. He served in the Corps of Engineers 

 (Lt. Colonel), U. S. Army from 1940 to 1946. 

 He received a Ph.D. in geology from the 

 University of Colorado in 1950. He is As- 

 sociate Professor of Geology in the Depart- 

 ment of Geological Engineering at the Colo- 

 rado School of Mines. 



Gilmon A. Hill received a Ph.B. in 1946, 

 an M.S. (geology and geophysics) in 1947, 

 and an M.S. (physics) in 1948 from the 

 University of Wisconsin. From 1950 to 1951 

 he attended Stanford University. He was a 

 research physicist-geologist with California 

 Research Corporation from 1948 to 1949 and 

 an instructor in physics at Riverside College 

 from 1949 to 1950. He was a geological con- 

 sultant from 1951 to 1953 and since that time 

 has been President of Petroleum Research 

 Corporation which he founded. His research 

 has been primarily a study of petroleum en- 

 trapment under hydrodynamic conditions. 



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