The cheirolepidiaceous conifers Frenelopsis occidentalis Heer and Watsoniocladus valdensis (Seward) in the Wealden of Germany

Author： Watson J.   Alvin K.L.  

Publisher： Academic Press

ISSN： 0195-6671

Source： Cretaceous Research, Vol.20, Iss.3, 1999-06, pp. : 315-326

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