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2. Maretskaya A.Y. and Maretskaya V.N., Agricultural Sector of the Murmansk Region: History of Development, Current State (Apatity, FRSC KSC RAS, 2018) p.108
3. Kislykh E.E., Environmental Bases of Soil Fertility Regulation in Conditions of Intensive Anthropogenic Impact (Petrozavodsk, Publishing House of PGU, 2002) p. 38