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period smithsonian libraries science mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.31 (1883)mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.30 (1882)atlas new york botanical garden luesther t. mertz library bacillariophyceae mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.16 (1871)

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