Detailed information for reference 33894Wright, C.W., J.H. Calloman, and M.K. Howarth (1996) Treatise on Invertebrate Paleontology, Part L, Mollusca 4, Revised, Volume 4: Cretaceous Ammonoidea. Kaesler, R.L. (ed.) Geological Society of America and University of Kansas Press. , 216 figs.
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