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Geomagnetic activity at Wingst Observatory from 1957 to 1985 in comparison to that at fredericksburg and college and toKp

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References

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Voppel, D. Geomagnetic activity at Wingst Observatory from 1957 to 1985 in comparison to that at fredericksburg and college and toKp. Deutsche Hydrographische Zeitschrift 41, 227–235 (1988). https://doi.org/10.1007/BF02225932

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