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地质学报 1929
THEVOLCANICROCKSINPEIPIAOREGIONAbstract: INTRODUCTION.ThevolcanicrocksinPeiPiaoregionhavebeenalreadynoticedbydifferentauthors.Theywere,however,onlystratigraphicallyclassifiedintotwoseriesknownastheUpperVolcanicandtheLowerVolcanic,whiletheirpetrographicalcharactersandrealrocktypesareyetinvague.
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