En
RuI. F. Babkov. Information on the geographical work, conducted in 1869 on the border of West Siberia and China.
I. F. Babkov. Information on the geographical work, conducted in 1869 on the border of West Siberia and China.
News of the imperial Russian geographical society.1870. T. 6
News of the imperial Russian geographical society.St. Petersburg: B. and., 1890.1870 T. 6. 1870.
1870
Русское географическое общество