En
RuN. A. Sokolov. Report on certain features of physical and geographical specifics of Russian Altai.
N. A. Sokolov. Report on certain features of physical and geographical specifics of Russian Altai.
News of the Imperial Russian Geographical Society. 1887. T. 23
News of the Imperial Russian Geographical Society. St. Petersburg: B. and., 1890.
1887, T. 23. 1888.
1887, T. 23. 1888.
1888
Русское географическое общество