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2. Progymnosperms;Beck,1988
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4. lnternational Field Symposium “The Devonian and Lower Carboniferous of northern Gondwana”, Field Guidebook;Becker,2013
5. Devonian conodont and ammonoid succession of the eastern Tafilalt (Ouidane Chebbi section), Anti-Atlas, Morocco;Belka;Acta Geologica Polonica,1999