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Message * Borealʹnai︠a︡ Sredni︠a︡i︠a︡ I︠u︡ra Rossii Ammonity i Zonalʹnai︠a︡ Stratigrafii︠a︡ Baĭosa, Bata i Kellovei︠a︡ - 5020301795 - 9785020301795