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  1. Directions for preserving leaves for decorative purposes.
    By: Ricker, Percy Leroy,
    Publication info: [Place of publication not identified] :[publisher not identified],[1924?]
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. A preliminary list of Maine fungi, by Percy LeRoy Ricker ...
    By: Ricker, Percy Leroy,
    Publication info: Orono, Me.,1902.
    Contributed by: University of California Libraries (archive.org)
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