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Graphic depiction of the river networks composing the Black Sea basin.
Snapshot of a statistical table describing the annual fluctuations in the freezing and melting of Russian rivers.
List of statistical tables included in the "Materials for statistics on river navigation in European Russia."
Title page of the "Materials for statistics on river navigation in European Russia" volume.
Portrait of Petr Petrovich Semenov-Tian-Shanskij (1827-1914), Russian geographer and statistician.
