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periodsmithsonian librariesbonemémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.20 (1873)plantsshellmémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.22 (1874-1876)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.19 (1873)diagrammémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.14 (1870)
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