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  1. Californian Olivellas
    By: Gifford, D. S. - Gifford, E W
    Type: Article
    In: The Nautilus.
    Volume: 57
    Date: 1944
    Page Range: 73--80
    Publication info: Melbourne, Fla., etc.,American Malacologists, inc., etc.
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  2. Color variation in Olivella biplicata
    By: Gifford, D. S. - Gifford, E W
    Type: Article
    In: The Nautilus.
    Volume: 55
    Date: 1941
    Page Range: 10--12
    Publication info: Melbourne, Fla., etc.,American Malacologists, inc., etc.
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  3. Color variation in Olivella biplicata in various localities
    By: Gifford, D. S. - Gifford, E W
    Type: Article
    In: The Nautilus.
    Volume: 56
    Date: 1942
    Page Range: 43--48
    Publication info: Melbourne, Fla., etc.,American Malacologists, inc., etc.
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  4. Olivella pycna
    By: Gifford, D. S. - Gifford, E W
    Type: Article
    In: The Nautilus.
    Volume: 55
    Date: 1942
    Page Range: 92--93
    Publication info: Melbourne, Fla., etc.,American Malacologists, inc., etc.
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