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Message * Problemy Okhrany Okruzhai︠u︡shcheĭ Sredy Na Urbanizirovannykh Territorii︠a︡kh, Varna-Permʹ, 97 Materialy Bolgarsko-Rossiĭskoĭ Nauchnoĭ Konferent︠s︡ii Molodykh Uchenykh, Aspirantov i Studentov, Ii︠u︡nʹ 1997 G., Permʹ-Avgust 1997 G., Varna - 5794400331 - 9785794400335