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Birkenmajer et al. 1968
Birkenmajer, K., Grocholski, A., Milewicz, J. and Nairn, A.E.M. (1968).
Palaeomagnetic studies of Polish rocks II. The Upper Carboniferous and Lower Permian of the Sudetes.
Annales Societe Geologique de Pologne 38: 435-474.
Journal
Annales Societe Geologique de Pologne