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  • Since the entering into force of the 1928 Convention Relating to International ACExhibitions, the Bureau International des Expositions (BIE; English: International Exhibitions Bureau) has served as an international sanctioning body for world’s fairs. BIE-approved fairs are of three types: universal, international, and specialized. They usually last from three weeks to six months. Since the entering into force of the 1928 Convention Relating to International Exhibitions, the Bureau Int

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