Isotope Analysis Using the Geomagnetic Method Soutoul, A. ; Engelmann, J. J. ; Goret, P. ; Juliusson, E. ; Koch-Miramond, L. ; Masse, P. ; Petrou, N. ; Rio, Y. ; Risbo, T. Abstract Publication: International Cosmic Ray Conference Pub Date: 1981 Bibcode: 1981ICRC....9..105S