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UNITED STATES - AUGUST 23: Workers evacuate the office buildings along 1st Street NE near Union Station following a magnitude 5.9 earthquake which struck the Washington area on Tuesday, Aug. 23, 2011. (Photo By Bill Clark/Roll Call)

UNITED STATES - AUGUST 23: Workers evacuate the office buildings along 1st Street NE near Union Station following a magnitude 5.9 earthquake which struck the Washington area on Tuesday, Aug. 23, 2011. (Photo By Bill Clark/Roll Call)

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