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https://wals.info/valuesets/71A-hmr WALS Online - Datapoint Hamer / The Prohibitive wals online datapoint hamer prohibitive https://wals.info/valuesets/71A-kha WALS Online - Datapoint Khalkha / The Prohibitive wals online datapoint prohibitive https://www.econstor.eu/handle/10419/129857 EconStor: Opportunities for cooperation in removing prohibitive trade barriers EconStor is a publication server for scholarly economic literature, provided as a non-commercial public service by the ZBW. opportunities cooperation removing prohibitive trade