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  1. The ferns of Great Britain: illustrated by John E. Sowerby ... The descriptions, synonyms, &c., by Charles Johnson.
    By: Sowerby, John Edward, - Johnson, Charles,
    Publication info: London :J. E. Sowerby,1855.
    Contributed by: University of California Libraries (archive.org)
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  2. The grasses of Great Britain,
    By: Sowerby, John Edward, - Johnson, Charles,
    Publication info: London,R. Hardwicke[1861]
    Contributed by: Cornell University Library
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