Foraminifera source request

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Durkina, A. V. (1959). Фораминиферы нижнекаменноугольных отложений Тимано-Печорской провинции - Foraminifera of the Lower Carboniferous Deposits of the Timan-Pechora Province. Proceedings of the Oil Research Geological Institute (ВНИГРИ-VNIGRI). 136: 132-389.