1. An Introduction to Paleobotany;Arnold,1947
2. Fossil floras suggest stable, not drifting, continets;Axelrod;J. Geophys. Res.,1963
3. Permian (of Tasmania);Banks;J. Geol. Soc. Aust.,1962
4. Les grands ensembles sédimentaires du Paléozoïque inférieur du Sahara;Beuf,1968
5. The Dwyka glaciation and the Ecca epiglacial beds of the Congo basin;Boutakoff,1940