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The molluscan fauna of Szechwan Province had been worked outby several distinguished authorities during the past few decades.Inrecent years,Dr.Haas of Senckenberg Museum reported on some collec-tions made in Kwantung,Szechwan,and Hupei Provinces by Dr.K. 相似文献
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The Tertiary Gastropoda from the lacustrine beds of Yungningformation had been studied by Odhner in 1930,and more recently byS.C.Hsu.The considerable number of new species found.by successiveinvestigators show that the Yungning formation is rich in molluscan 相似文献
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