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|  |  | Keppen, Peter Ivanovich (1793-1864). |  |  |  | On the consumption of bread in Russia: (Honored by him Academician Keppen in the meeting of the Academician of Sciences August 16, 1839). - [St. Petersburg, 1840]. -20 s. ; 21. - Ott. from "Journal of the Ministry of Foreign Affairs". 1840, June, p. 402-421. - Without tit. l. and the region
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 | Source of electronic copy: RSL Location of original storage: Кл 36/265
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