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smithsonian librariesperiodscienceplantsbonemémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.20 (1873)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.27 (1880)shellmémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.25 (1878)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.22 (1874-1876)
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