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Heavy burden of environmental problems on Caspian Sea

Heavy burden of environmental problems on Caspian Sea
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Caspian seaOceans generalPersian gulfRepublic of azerbaijanRussian federationAhmad reza lahijanzadehFramework conventionResearch instituteNational institute for oceanographyNational day of the caspian seaDepartment of environmentTehran conventionNational dayTehran timesSea dayVolga river