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  1. The influence of calcium, magnesium and potassium nitrates upon the toxicity of certain heavy metals toward fungus spores ... by Lon A. Hawkins.
    By: Hawkins, Lon Adrian,
    Publication info: Baltimore,1913.
    Contributed by: University of California Libraries (archive.org)
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  2. The influence of calcium, magnesium and potassium nitrates upon the toxicity of certain heavy metals toward fungus spores ...
    By: Hawkins, Lon Adrian,
    Publication info: Baltimore,1913.
    Contributed by: The Johns Hopkins University Sheridan Libraries (archive.org)
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  3. The water-relation between plant and soil,
    By: Livingston, Burton Edward, - Hawkins, Lon Adrian, - Pulling, Howard Edward.
    Publication info: Washington, D. C.,Carnegie Institution of Washington,1915.
    Contributed by: Cornell University Library
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  4. The water-relation between plant and soil,
    By: Livingston, Burton Edward, - Hawkins, Lon Adrian, - Pulling, Howard Edward,
    Publication info: Washington, D.C.Carnegie Institution of Washington1915
    Contributed by: Gerstein - University of Toronto (archive.org)
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