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UNITED STATES - APRIL 9: Heavy machinery moves earth on the National Mall near 7th Street as part of a 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: Heavy machinery moves earth on the National Mall near 7th Street as part of a 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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