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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Burch, J. B. (John Bayard), - United States. Agricultural Research Service.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Agricultural Research Service, 1960
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Slugs (Mollusks)  Snails  Snails as carriers of disease