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Message * Engineering Geology of Karst Proceedings International Symposium 6-8 July 1992 (Perm) Russia = Inzhenernai︠a︡ Geologii︠a︡ Karsta : Doklady Mezhdunarodnogo Simpoziuma, 6-8 Ii︠u︡li︠a︡ 1992 (Permʹ), Rossii︠a︡ - 582410039X - 9785824100396