Obruchev V. A. Istoriya geologicheskogo issledovaniya Sibiri. Period vtoroy ( 1801-1850 gody ): Gelmersen, Gofman, Middendorf, Chikhachev, Shchurovskiy, Erman./Obruchev V. A. History of geological exploration of Siberia. Period two (1801-1850): Helmersen, Hoffman, Middendorf, Chikhachev, Shchurovsky, Erman. In Russian - landofmagazines.com

TransliterationObruchev V. A. Istoriya geologicheskogo issledovaniya Sibiri. Period vtoroy ( 1801-1850 gody ): Gelmersen, Gofman, Middendorf, Chikhachev, Shchurovskiy, Erman.

In EnglishObruchev V. A. History of geological exploration of Siberia. Period two (1801-1850): Helmersen, Hoffman, Middendorf, Chikhachev, Shchurovsky, Erman. In Russian

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