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periodsmithsonian librariessciencepictorial worksbotanymissouri botanical gardenpeter h. raven library#bhlcurtismémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.17 (1872)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.31 (1883)
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