U.S. Parcel Post stamps of 1912–13 - Wikipedia
U.S. Postal Service proposes price hikes for mailing services
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USPS RATE HIKE JANUARY 22, 2023 – Official Mail Guide (OMG)
Stamp price increase 2023: USPS proposes July postage stamps hike
USPS Prices Increase on Sunday July 10. Here's How Much More It Will Cost to Send Mail
U.S. Postal Service's stamp price increase goes into effect - CBS Pittsburgh
USPS Rate Change Effective August 29, 2021
Media Mail: Summary of April 2016 USPS Rate Decrease - Stamps.com Blog
FAQs on the April 2016 Postage Rate Decrease - Stamps.com Blog
USPS® Rate Change Effective January 24, 2021
Stamp prices increase again