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USPS to hike the cost of a first-class stamp to 66 cents on July 9
USPS: 5 facts about Forever stamps - 21st Century Postal Worker
Presidents of the United States on U.S. postage stamps - Wikipedia
USPS Forever Stamps Four Flags Booklet of 20 Stamps
Four Flags Giclée Print (All Stamps) from USPS
Buying discount postage stamps online? Don't fall victim to scam
Here's all the first ladies who got their own U.S. postage stamp
US Sc#4648b M/NH Pane of 20 Forever stamps Justice, Equality, Freedom, Liberty
Sculptor sues Postal Service over 'fake Liberty' stamp