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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ladd, H S
    Type: Article
    In: The veliger
    Volume: 18
    Date: 1975
    Page Range: 134--138
    Publication Info: Berkeley, CA, California Malacozoological Society,
  2. By: Abbott, R. Tucker (Robert Tucker), - Ladd, H S
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 41
    Date: 1951
    Page Range: 335--338
    Publication Info: Washington [etc Washington Academy of Sciences]
  3. By: Ladd, H S
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 42
    Date: 1952
    Page Range: 207--208
    Publication Info: Washington [etc Washington Academy of Sciences]