Harold Bloom is a native of Brooklyn, New 

 York, and received a B.S. degree in chem- 

 istry from Brooklyn College in 1935. He con- 

 tinued graduate study while he was employed 

 as a teacher in the New York City schools and 

 as a chemist at the sugar refinery of Sucrest 

 Corporation. In 1941 he joined the U. S. Geo- 

 logical Survey where he worked in the topo- 

 graphic and photogrammetric sections. Later 

 he was transferred to the Geochemistry and 

 Petrology Branch of the U. S. Geological Sur- 

 vey, where the Geochemical Prospecting Lab- 

 oratory was being formed. In 1954 he be- 

 came a consultant; his principal clients were 

 the Selco Exploration Company, Ltd., and the 

 Dominion Gulf Company, both of Canada. Since 1955 he has been a Special 

 Lecturer in geochemistry at the Colorado School of Mines. His publications are 

 in the field of geochemical prospecting and deal with the development and 

 applications of chemical tests to field exploration problems. 



Robert B. Bourn received a B.S. degree in 

 geology from the University of Chicago in 

 1941. Since 1941 he has been employed by 

 the Seismograph Service Corporation and is 

 now Assistant Vice President and Manager of 

 the Southern Division, Houston, Texas. He 

 has worked in offshore Canada, offshore East 

 Coast, Mid-Continent, Illinois-Indiana, West 

 Texas-New Mexico, and Gulf Coast areas. He 

 is a member of the American Association of 

 Petroleum Geologists, Society of Exploration 

 Geophysicists, American Association for the 

 Advancement of Science, American Geo- 

 physical Union and other local technical 

 societies. 



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