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PHANEROGAMARUM MONOGRAPHIAE: Vol. 11: Shetler, Stanwyn G.: Variation and Evolution of the Nearctic Harebells (Campanula subsect. Heterophylla). 1982. 50 figs. (mainly photographs). 516 p. gr8vo. Bound. 103.00 (8155) (ISBN 978-3-7682-1241-0)
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