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4. G. V. Dobrovol’skii and G. S. Kust, “Concept of Soil Resources: Current State, Background to Reconsideration, and Problem Setting,” in Role of Soils in the Biosphere: Proceedings of the Soil Science Institute, MSURAS (Moscow, 2003), No. 3, pp. 6–23 [in Russian].
5. A. D. Dumnov, N. G. Rybal’skii, E. D. Samotesov, Yu. I. Maksimov, et al., “Land Resources of Russia,” in Natural Resources and Environment of Russia (Analytical Report) Ed. by B. A. Yatskevich″, V. A. Pak, and N. G. Rybal’skii (NIA-Priroda, Moscow, 2001), pp. 107–150 [in Russian].