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  1. Deux excursions botaniques
    By: Leresche, Louis-François-Jules-Rodolphe - Levier, Emile,
    Publication info: Lausanne : Imprimerie Georges Bridel 1881
    Contributed by: Biblioteca Digital del Real Jardin Botanico de Madrid
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  2. 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 / S. Sommier et E. Levier, cum tabulis lithographicis XLIX ab E. Levier et C. Cuisin delineatis, et 1 tabula phototypica.
    By: Sommier, Stefano, - Levier, Emile,
    Publication info: Petropoli :Typ. Imp. akademii nauk,1900.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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