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International Geological Congress.Session (7; Petersburg; 1897).Organizing committee.Report on the status and activities of the Geological Committee ... - St. Petersburg, 1886-1929.- 24. -StoodFor 1906: A summary of the twenty-five-year-old activity of the Geological Committee and the report ...Reports for 1895-1914: Ot.From "Izv. Geol. Com."T. 15-34..I. Geological Com (Leningrad).Electronic Source: PB
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