When did the US Postal Service begin and what was its purpose?
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How the U.S. Postal Service Works
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U.S Postal Service letter carriers hold rally in downtown Eugene as they continue to work without a
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How the UK Postal Service (Royal Mail) Operates
How to use the automated self service kiosk at the US postal service
Former Postal Inspector Discusses Mail Screening Process
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Postal procedure sends mail back to sender
Unveiling the U.S. Postal Inspectors: Guardians of the Mail
Understanding postal codes