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Message * Mezhdunarodnai︠a︡ Nauchnai︠a︡ Konferent︠s︡ii︠a︡ "Izuchenie i Okhrana Biologicheskogo Raznoobrazii︠a︡ Prirodnykh Landshaftov Russkoĭ Ravniny" Posvi︠a︡shchena 80-Letii︠u︡ Penzenskogo Zapovednika : Sbornik Materialov 18-19 Mai︠a︡ 1999 G. - 5835600062 - 9785835600069