Variability of averaged annual impedances of the Earth and their spatial gradients in Europe von Semenov, V. Yu., Petrishchev, M. S.

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Methods of magneto-variation sounding of the Earth's mantle within the range of periods 10 4 -10 5 s von Ladanivskiy, B. T., Semenov, V. Yu., Logvinov, I. M.

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