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UNITED STATES - APRIL 9: Workers oversee heavy machinery as they move earth on the National Mall near 7th Street as part of an restoration project that includes installing more durable grass and improving soil drainage, April 9, 2015. The project is expected to be completed by January 2017. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - APRIL 9: Workers oversee heavy machinery as they move earth on the National Mall near 7th Street as part of an restoration project that includes installing more durable grass and improving soil drainage, April 9, 2015. The project is expected to be completed by January 2017. (Photo By Tom Williams/CQ Roll Call)

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