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  1. Rubber-content of North American plants by Harvey M. Hall and Frances L. Long.
    By: Hall, Harvey Monroe, - Long, Frances Louise,
    Publication info: WashingtonCarnegie Institution of Washington1921
    Contributed by: Gerstein - University of Toronto (archive.org)
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  2. Rubber-content of North American plants,
    By: Hall, Harvey Monroe, - Long, Frances Louise,
    Publication info: Washington, Carnegie institution of Washington,1921.
    Contributed by: Cornell University Library
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