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  1. 1
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    Control of purple scales, whiteflies, and citrus red mites on grapefruit trees with phosphorus insecticides / by Spencer, Herbert, 1894-

    Published 1956
    Government Document Book

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  2. 2
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    Control of the purple scale on citrus with parathion / by Spencer, Herbert, 1894-

    Published 1952
    Government Document Book

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