Maps of Eastern and South-Eastern Europe, Russia Empire and USSR.
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The map is taken from La Péninsule balkanique. Géographie humaine (1918). This book is a study of the physical and human geography of the Balkans by Jovan Cvijić (1865-1927), a Serbian geographer and ethnographer, published in Paris.
Этнографическая карта Европейской России, составленная по материалам академика Петра Кеппена
Санкт-Петербург, 1857 г.