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Khalfin, L. L. (1948). Fauna i stratigrafiya devonskikh otlozheniy Gornogo Altaya [The fauna and stratigraphy of the Devonian Gorny Altai]. Izvestiya Tomskogo Politekhnicheskogo Instituta. 65(1): 1-464.
Khalfin, L. L. (1948). Fauna i stratigrafiya devonskikh otlozheniy Gornogo Altaya [The fauna and stratigraphy of the Devonian Gorny Altai]. Izvestiya Tomskogo Politekhnicheskogo Instituta. 65(1): 1-464.