T. H. Dunn graduated from the University 

 of Colorado in chemistry and later completed 

 a special course in colloid chemistry at Mas- 

 sachusetts Institute of Technology. He was 

 with the Midwest Refining Company in Wyo- 

 ming for a few years and from 1933 has been 

 with Stanolind Oil and Gas Company (Pan- 

 American Petroleum Corp.) at Tulsa, first as 

 Chief Chemist in the Producing Department, 

 then as Research Group Supervisor in the 

 Research Department (1943 to 1953). His 

 principal research activities have been con- 

 cerned with drilling fluids, oil field corrosion, 

 and geochemical analysis of soils and soil 

 gases. 



Charles A. Einarsen received the Petroleum 

 Engineering degree from Colorado School of 

 Mines in 1947. From 1947 to 1953 he was 

 employed by Stanolind Oil and Gas Company 

 as petroleum engineer, drilling fluids en- 

 gineer, area operations engineer, and re- 

 search engineer. In 1953 he was employed 

 by Cherokee Laboratories as Area Manager 

 for West Texas and New Mexico. In 1957 

 he joined the staff of Petroleum Research Cor- 

 poration as a petroleum engineer in the 

 Hydrodynamic Analysis Department. 



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