Activity of the earth's magnetism and magnetic characterisation of days / G. van Dijk
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Activity of the earth's magnetism and magnetic characterisation of days / G. van Dijk
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Koninklijk Nederlandsch Meteorologisch Instituut ; No. 102
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Activity of the earth's magnetism and magnetic characterisation of days
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Activity of the earth's magnetism and magnetic characterisation of days / G. van Dijk