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  1. Description of a new genus and species of freshwater gastropod mollusk (Scalex petrolia) from the Etchegoin Pliocene of California
    By: Hanna, G Dallas - Gaylord, E G
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series.
    Volume: 13
    Series: 4
    Date: 1924
    Page Range: 147--149
    Publication info: San Francisco,California Academy of Sciences.
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