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  1. Diseases of deciduous forest trees,
    By: Schrenk, Hermann von, - Spaulding, Perley,
    Publication info: Washington, D.C.Govt. Print. Off.1909
    Contributed by: Earth Sciences - University of Toronto (archive.org)
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  2. Investigations of the white-pine blister rust /
    By: Spaulding, Perley,
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1922.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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