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| Event:Measuring Happiness and Opportunity Around the World |
| City | Washington D.C. + |
|---|---|
| Country | United States + |
| Date | 28 September 2011 + |
| Modification dateThis property is a special property in this wiki. | 1 April 2013 23:24:22 + |
| Categories | Subjective well-being, Events, 28/09/2011 |
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