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Pravoslavlev, P.A. (1939). Didacna Eichw. drevnekaspiyskikh otlozheniy Baskunchakskogo rayona [Didacna Eichw. from ancient Caspian deposits of the Baskunchak region]. Uchenyye zapiski Leningradskogo gosudarstvennogo universiteta, seriya geologo-pochvennykh nauk. 34(7): 209-274.
Pravoslavlev, P.A. (1939). Didacna Eichw. drevnekaspiyskikh otlozheniy Baskunchakskogo rayona [Didacna Eichw. from ancient Caspian deposits of the Baskunchak region]. Uchenyye zapiski Leningradskogo gosudarstvennogo universiteta, seriya geologo-pochvennykh nauk. 34(7): 209-274.
