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| Listed by "W" | |||||||||||||||||||||||||||
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| Abbreviation | Organisation |
| WAEC | West African Economic Community, Ouagadougou/ Upper Volta |
| WHO | World Health Organization, (UN), Geneva |
| WMO | World Meteorological Organization, (UN), Geneva |
| WPO | World Packaging Organization, Hong Kong |
| WTCA | World Trade Centers Association, New York |
| WTO | World Tourism Organization, (UN), Madrid |