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    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: II [by Roy D. Speirs and Joe H. Lang

    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: II [by Roy D. Speirs and Joe H. Lang von Speirs, Roy D. 1928

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  2. 2
    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: III / [by Roy D. Speirs and Lehman L. McDonald]

    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: III / [by Roy D. Speirs and Lehman L. McDonald] von Speirs, Roy D. 1928

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  3. 3
    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: III / [by Roy D. Speirs and Lehman L. McDonald] : no.1039(1975)

    Contact, residue, and vapor toxicity of new insecticides to stored-product insects: III / [by Roy D. Speirs and Lehman L. McDonald] : no.1039(1975) von Speirs, Roy D. 1928

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    Contact, residue, and vapor toxicity of new insecticides to stored-product insects / [by Roy D. Speirs]

    Contact, residue, and vapor toxicity of new insecticides to stored-product insects / [by Roy D. Speirs] von Speirs, Roy D. 1928

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