This paper is a report of an investigation of the possibilities of changing the character of reflection records by shooting explosives which vary in detonation velocity from 5000 to 21,000 ft/sec; and also to determine what energy return would result from shooting such various explosives in refraction work. Magnolia Petroleum Company under my direction carried out these investigations on crews in Florida, Mississippi and Texas. A discussion of results and presentation of records will be made.

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