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2. A classification of the Jurassic ammonites;Arkell;Journal of Paleontology,1950
3. Mémoire sur les bélemnites, considérées zoologiquement et géologiquement;de Blainville,1827
4. Check list of the invertebrate fossils of North America: Eocene and Oligocene;Conrad;Smithsonian Miscellaneous Collections,1866