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A short silent film showing the Multi-Position Letter Sorting Machine (MPLSM). MPLSM operators used 20-key keyboards to type in two or three numbers from the ZIP code, so the machine could then sort the mail into one of 277 or more bins representing sections of the country. These operators sorted mail at rates of 60 letters per minute. Visit the online exhibit: http://npm.si.edu/systemsatwork

A short film showing the Carrier Sequence Bar Code Sorter (CSBCS) in action. The CSBCS is an automated machine that sorts the mail through the barcode to an individual letter carrier's mail route. Visit the online exhibit: http://npm.si.edu/systemsatwork

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: https://postalmuseum.si.edu/systemsat... View captioned video: http://youtu.be/agVU6KHmLR4

You see stamps every day but have you ever really looked at them? "Stamps: An American Journey" tells the surprising story of the journey of stamps from an idea, to art, to issued stamp. It features National Postal Museum Curator of Philately Cheryl Ganz. Thanks to The United States Postal Service for providing this exciting video. Please contact the United States Postal Service for video use information and permission.