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am References
Copyright WDC C1 for STP at RAL.
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Indices Kn, Ks, Km (1964 - 1967)
CNRS, pages 156, Paris 1968.
Author Mayaud, P.N.
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Derivation, Meaning, and Use of Geomagnetic Indices
AGU (Washington D.C.), 1980.
Author Mayaud, P.N.