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Keywords: Helmersen.jpg ru Русский геолог академик Гельме сен Г П en Russian geologist academician Gregor von Helmersen - 1880 1885 Исто ия Академии наук СССР Л аука 1964 Т 2 С 107 author other versions Custom license marker 2016 02 23 PD-RusEmpire 1803 births 1885 deaths Alumni of the National Mineral Resources University Cartographers from Russia Knights of the Order of St Alexander Nevsky Members of the Russian Academy of Sciences Alumni of the University of Tartu Gregor Helmersen |