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Petr Petrovich Semenov-Tian-Shanskij
Portrait of Petr Petrovich Semenov-Tian-Shanskij (1827-1914), Russian geographer and statistician.
Alexandre Quinet
Bibliothèque nationale de France (http://gallica.bnf.fr/ark:/12148/btv1b84507478/f1.item)
public domain
photograph