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Stumbur H.A. (1956). On nautiloids of the Kohila stage (upper Ordovician of the Baltics). Tartu Riikliku Ülikooli Toimetised [= Ученые записки Тартуского государственного университета]. 42: 176-185. [In Russian].
Stumbur H.A. (1956). On nautiloids of the Kohila stage (upper Ordovician of the Baltics). Tartu Riikliku Ülikooli Toimetised [= Ученые записки Тартуского государственного университета]. 42: 176-185. [In Russian].