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About the United States Postal Service - Who we are - About.usps.com
United States Postal Service - Wikipedia
What We Do - About.usps.com
Postal Facts - U.S. Postal Service
Top facts you should know | Postal Facts - U.S. Postal Service
A decade of facts and figures | Postal Facts - U.S. Postal Service
U.S. Postal Service (USPS) - USAGov
About the United States Postal Service (USPS) - ThoughtCo
How the U.S. Postal Service Works - HowStuffWorks
Welcome | USPS