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Ru| Description |
The struggle of the forest with the steppe in the Penza province: a map of the vegetation cover of the Penza province / Sprygin, I. I. - Penza: ed.Penza Gubzema, 1922. -605: Territory..Electronic copy source: Penza about
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| Publisher | Пенза: Изд. Пензенского Губземуправления |