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The lunar and solar daily variations of the horizontal geomagnetic vector at Gre German 01.12.1968 Paperback / Softback Fr. 16.90 1-3 weeks (not available at short notice)
Ein Q-Index für erdmagnetische Aktivität in viertelstündlichen Intervallen German 01.12.1956 Paperback / Softback Fr. 16.90 1-3 weeks (not available at short notice)