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  1. A college textbook of pharmaceutical botany :with pharmaceutical and medical applications, especially adapted for the use of students of pharmacy and economic botany and as a reference for pharmacists, chemists and students in structural and systematic botany /by Heber W. Youngken.
    By: Youngken, Heber W.
    Publication info: Philadelphia :P. Blakiston's Son,c1938.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Missouri Botanical Garden's Materia Medica
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  2. Pharmaceutical botany,
    By: Youngken, Heber W. - Stewart, Francis Edward,
    Publication info: Philadelphia,P. Blakiston's son & co.[c1914]
    Contributed by: Cornell University Library
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  3. Pharmaceutical botany, with glossary of botanical terms.
    By: Youngken, Heber W.
    Edition: Ed. 3, rev.
    Publication info: Philadelphia,Blakiston[1921]
    Contributed by: Gerstein - University of Toronto (archive.org)
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