[5]
Carboniferous and Permian floras of the Northern continents.In Atlas of palaeobiogeography edited by A. Hallam, Elsevier Sci .2 Chaloner,W. G. and Meyen,S. V. Pub. Com . 1973
[5]
Carboniferous and Permian floras of the Northern continents.In Atlas of palaeobiogeography edited by A. Hallam, Elsevier Sci .2 Chaloner,W. G. and Meyen,S. V. Pub. Com . 1973