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http://www.wttc.org/site_media/uploads/downloads/Economic_Impact_Summary_2014_2ppA4_FINAL.pdf
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http://www.targetinginnovation.com/tlx/assets/documents/uploaded/general/Final%20Draft%20Report%20Layout%20v4.pdf
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http://ir.tripadvisor.com/releasedetail.cfm?releaseid=808058
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