Each day the United States Postal Service processes hundreds of millions of pieces of mail and delivers to over 150 million addresses. At the center of this bustling postal network are more than a hundred Processing and Distribution Centers spread across the United States.This video shows how letters, catalogs, magazines, and parcels make their way through mail centers. Click the "Full screen" button in the lower right corner of the video to watch full-screen.Visit the online exhibit: http://npm.si.edu/systemsatworkView captioned video: http://youtu.be/agVU6KHmLR4
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