Degradation of landscapes in the South of the Privolzhsky Upland von Yuferev, Valery Grigorievich, Zavalin, Aleksey Anatolyevich, Pleskachev, Yuri Nikolaevich, Vdovenko, Anastasia Vasilievna, Fomin, Sergey Denisovich, Vorontsova, Elena Sergeevna

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