Foraminifera source request

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Vissarionova, A. I. (1948). In: Стратиграфия и фораминиферы нижнего карбона Русской платформы и Приуралья-Stratigraphy and Foraminifera of the Lower Carboniferous of the Russian Platform and Cis-Ural. Академия наук СССР Труды ИГН-Akademya Nauk SSSR Trudy Instituta Geologicheskikh Nauk. v. 62, ser. geol. no. 19: 190-195; 216-226.