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Results of Bordoni peak measurements made at 10, 30, and 60 Mc/sec in relatively impure deformed polycrystalline aluminum are compared with previous measurements at 5 Mc/sec and 40 kc/sec. The observed difference between the results of these measurements and those of previous measurements appears to depend on the purity of the material.
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Einspruch et al. (1958) studied this question.
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