Author: Valeriani, Giuseppe - Sokolov, Ivan Aleksi︠e︡evich - Imperatorskai︠a︡ Akademīi︠a︡ Naukʺ I Khudozhestvʺ (Russia) - Treskot, Johann - Makhaev, Mikhail Ivanovich - Michurin, Ivan Fedorovich

Source: Library of Congress - Maps

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