Beginning with the first stamps in 1847, the Postal Ser…
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File:The United States 1949 Mi 601 stamp (75th anniversary of the UPU. Post office department in Washington, D.C. UPU emblem).jpg - Wikipedia
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The Postal Service Guide to U.S. Stamps, 37th ed: United States Postal Service: 9780062024367: : Books
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[United States Postal Service] on . *FREE* shipping on qualifying offers. The Postal Service Guide to US Stamps, 36th Edition
The Postal Service Guide to US Stamps, 36th Edition