A rescue helicopter flies through a neighorbood in search of survivors in the aftermath of Hurricane Katrina in New Orleans, Louisiana September 4, 2005. Katrina's devastation of the U.S. Gulf Coast will hit the world's biggest economy harder than any previous storm, analysts say, but the blow to growth could be more than offset later by the boost from reconstruction. Katrina's destructive journey across the southern United States last week wrecked New Orleans, displaced hundreds of thousands of people and may have killed thousands. [Robert Galbraith/Reuters]
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