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2. L. B. Vostokova, Candidate’s Dissertation in Biology (Moscow, 1972).
3. Geography of Soils and Soil Zoning of the Central Economic Region of the Soviet Union, Ed. by G. V. Dobrovolsky and I. S. Urusevskaya (Moscow State University, Moscow, 1972) [in Russian].
4. I. P. Gerasimov, “Soil-climatic facies of the plains of the Soviet Union and adjacent countries,” Tr. Pochv. Inst. im V. V. Dokuchaeva,8(5), (1933).
5. I. P. Gerasimov, “Relief and surface deposits in the European part of the Soviet Union,” in Soils of the Soviet Union (Academy of Sciences of the Soviet Union, Moscow, 1939), Vol. 1, pp. 27–92.