Foraminifera source request

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Kalmykova, M. A. (1960). Зональное расченение верхнего Палеозоя Дарваза по фузулинидам - Zonal demarcation in Darbaz Upper Palaeozoic according to fusulinid content. Informatsionnyi Sbornik VSEGEI. 35: 39-49.