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Li, Z.-Y.; Li, Y.-X.; Zhang, Y.-X.; Xie, K.; Li, Z.-C. (2022). New Discovery of Oligocene Gastropod Opercula from the Yehucheng Formation in Northwestern China. Acta Geologica Sinica - English Edition. 96(1): 61-70.
Li, Z.-Y.; Li, Y.-X.; Zhang, Y.-X.; Xie, K.; Li, Z.-C. (2022). New Discovery of Oligocene Gastropod Opercula from the Yehucheng Formation in Northwestern China. Acta Geologica Sinica - English Edition. 96(1): 61-70.
