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  1. Potter's cyclopaedia of botanical drugs and preparations / by R.C. Wren.
    By: Wren, R. C. - Holmes, Edward Morell,
    Edition: 2nd ed. / with additions by E. M. Holmes.
    Publication info: London :Potter & Clarke,[1915]
    Contributed by: University of California Libraries (archive.org)
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  2. Potter's cyclopedia of botanical drugs and preparations / by R. C. Wren.
    By: Wren, R. C.
    Publication info: London :Potter & Clarke,[1900-1950?].
    Contributed by: Gerstein - University of Toronto (archive.org)
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