Enumeratio plantarum anno 1890 in Caucaso lectarum : additis nonnullis speciebus a claris viris H. Lojka, G. Radde, N. Seidlitz et fratr. Brotherus in eadem ditione lectis Sommier, Stefano, 1848-1922 creator Levier, Emile, 1838-1911 contributor text book Petropoli Typ. Imp. akademii nauk 1900 1900
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FRE In French, with preface also in Russian. Includes indexes. Caucasus Plants Trudy Imperatorskago S.-Peterburgskago botanicheskago sada, t. 16 https://www.biodiversitylibrary.org/bibliography/9925 7589979 10.5962/bhl.title.9925 VXG