Não informado. (2001). Annual report on the mineral resources of the URSS. Geological Committee.
Citace podle Chicago (17th ed.)Não informado. Annual Report on the Mineral Resources of the URSS. Leningrad, Rússia: Geological Committee, 2001.
Citace podle MLA (8th ed.)Não informado. Annual Report on the Mineral Resources of the URSS. Geological Committee, 2001.
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