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R. P. Zimina, The Main Features of the Caucasian Natural Landscapes and Their Conservation, USSR, Arctic and Alpine Research, Vol. 10, No. 2, Mountain Geoecology and Land-Use Implications: Proceedings of the Symposium of the International Geographical Union Commission on High-Altitude Geoecology (May, 1978), pp. 479-488
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R. P. Zimina (1978) studied this question.
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