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In an anniversary volume, it seems appropriate to acknowledge my special debt to some who pioneered research in mining geophysics. From 1924 until the depression of 1930, the United Verde Copper Company, under leadership of its President, Robert E. Tally,* and H. deWitt Smith, supported a comprehensive program of research in mining geophysics directed by Dr. Max Mason, then Professor of Physics at the University of Wisconsin. To these, as well as to my associates in this program, B. B. Gauld, D. L. Hay,* C. B. Aiken* and D. C. Slichter, I wish to record my gratitude. The encouragement provided in those uncertain years of mining geophysics by the New Jersey Zinc Company and especially by the stimulating association with Walter O. Borcherdt* of that company, is also recalled with gratitude and pleasure. There will be occasion later to acknowledge the recent generous help from others who have furnished specific material for this paper. But I wish to make special note of a debt to those who ventured to support research in mining geophysics in a day when the gamble must have seemed great.

During recent decades the mining industry has been facing a great transition in prospecting. The transition is from the pioneer era when discoveries in outcrop were relatively easy, and numerous, to the present, when many common metals must be sought in blind ore bodies which show no trace at the surface. In petroleum prospecting this transition is now far along. Exploration for concealed oil structures at

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