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1 Title by Hopkins, Gordon J.  

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  1. The zebra mussel, Dreissena polymorpha--a photographic guide to the identification of microscopic veligers / report and photographs prepared by Gordon J. Hopkins.
    By: Hopkins, Gordon J.
    Publication info: [Toronto, Ont.] :Environment Ontario,c1990.
    Contributed by: Ontario Ministry of the Environment (archive.org)
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