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2. A Classopollis-containing male cone associated with Pseudofrenelopsis;Alvin;Palaeontology,1978
3. New gymnosperms from the Ticó flora, Santa Cruz province, Argentina;Archangelsky;Bull. Brit. Mus. Nat. Hist. Geol.,1966
4. On the genus Tomaxellia (Coniferae) from the Lower Cretaceous of Patagonia (Argentina) and its male and female cones;Archangelsky;J. Linn. Soc. Bot.,1968
5. Two new Late Triassic plants from the Petrified Forest of Arizona;Ash;J. Paleontol.,1973