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  1. 1
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    Differential susceptibility of white fir provenances to balsam twig aphid / by Ferrell, George T.

    Published 1989
    Government Document Book

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  2. 2
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    Aphides affecting apple

    Published 1907
    Government Document Microfilm Book

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  3. 3
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    Differential susceptibility of White Fir provenances to balsam twig aphid by Ferrell, George T.

    Published 1989
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    Connect to online resource
    Government Document Microfilm Book

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  4. 4
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    Aphids as virus vectors /

    Published 1977
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    eBook

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  5. 5
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    Flight activities of the green peach aphid Myzus persicae (Sulz.), a natural vector of potato leafroll virus in Colorado / by Berry, Ralph Eugene, 1940-

    Published 1967
    Government Document Book

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