Detailed information for reference 33897Arkell, W.J., B. Kummel, and C.W. Wright (1957) Mesozoic Ammonoidea. In: Treatise on Invertebrate Paleontology, Part L, Mollusca 4, Cephalopoda Ammonoidea. Treatise on Invertebrate Paleontology. Moore, R.C. (series ed.) Vol. L.
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