. Early geophysical papers of the Society of Exploration Geophysicists . "7^ SUPPORT AMPLIFIER B=3 METER RECTIFIER Fig. 3.—Arrangement of apparatus used to determine natural frequency of bar. » B. B. Weatherby, W. T. Born, and R. L. Harding, "Granite and Limestone Determinations in Arbuckle Mountains, Oklahoma," Bull. Amtr. Assoc. Petrol. Geol., Vol. 18, No. r (January, 1934). 672

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