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smithsonian libraries
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.16 (1871)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.28 (1881)
mémoires 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.30 (1882)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.8 (1865)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.26 (1879)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.27 (1880)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.3 (1861)
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