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  1. The hevea rubber tree in the Amazon Valley /
    By: La Rue, Carl Downey,
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1926.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. The results of selection within pure lines of Pestalozzia Guepini Desm., by Carl Downey La Rue.
    By: La Rue, Carl Downey,
    Publication info: Brooklyn, N. Y.,1922
    Contributed by: University of California Libraries (archive.org)
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