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Vertebrate cadastre of the Oryol region. Volume II. Birds: Monograph / Administration of the Oryol region, N.V. Vysheorodsky, ed. HELL. Numerova. - Eagle: Labor, 2012. - 605: The Natural Environment of Russia A letter from the head of the department Ivanov NF. from 07.17.17 № UE-1816.
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Source of the electronic copy: Department for Environmental Safety and Nature Management of the Orel Region |
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