| Detailed
    information for reference 33163 Arnold, T.S. (1998) Muracypraea Woodring, 1957 (Gastropoda: Cypraeidae) in the upper Miocene and lower Pliocene Latrania Formation (Imperial Group) of Imperial County, southern California. Festivus 30(8): 89-93.  PDF is 33MB (also available in 4 parts)
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