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地质学报 1930
THEMIOCENEANDRECENTMOLLUSCAOFPANAMABAYAbstract: INTRODUCTIONThematerialstudiedhasbeeninthePaleontogicalcollectionofColumbiaUniversityforseveralyears.Thelabelonthematerialreadsasfollows:"Broughtupbymarinedredgefromdepthsvaryingfrom10.ft.to40.ft.inthemudatthemouthoftheRioGrandenearLaBocaaboutonemilefrom
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