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2. Palynology and stratigraphy of some Upper Pennsylvanian and Permian rocks of the maritime provinces;BARSS;Geological Survey of Canada Paper,1963
3. Diadectes (Diadectomorpha, Diadectidae) from the Early Permian of central Germany, with a description of a new species;BERMAN;Annals of Carnegie Museum,1998
4. A new diadectid (Diadectomorpha), Orobates pabsti, from the Early Permian of Central Germany;BERMAN;Bulletin of Carnegie Museum of Natural History,2004
5. An overview of the invertebrate ichnotaxa from the Robledo Mountains ichnofauna (Lower Permian), southern New Mexico;BRADDY;New Mexico Museum of Natural History and Science Bulletin,1998