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periodsmithsonian librariesboneplantsmémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.20 (1873)diagrammémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.25 (1878)shellmémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.24 (1877)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.19 (1873)
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