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Message * Ėkologicheskie Osnovy Rat︠s︡ionalʹnogo Lesopolʹzovanii︠a︡ V Srednem Povolzhʹe Materialy Nauchno-Prakticheskoĭ Konferent︠s︡ii, Posvi︠a︡shchennoĭ 100-Letii︠u︡ So Dni︠a︡ Rozhdenii︠a︡ Doktora Biologicheskikh Nauk, Professora Ivana Stepanovicha Averkieva, 9-12 Apreli︠a︡ 2001 Goda - 5815800945 - 9785815800946