https://pmgdirect.net/current-postage-rate-chart/
Current Postage Rate Chart - Nonprofit Direct Mail Production
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https://dodoposters.com/poster-gallery/4d-minimum-foreign-letter-postage-rate-fingers/
4d Minimum Foreign Letter Postage Rate (fingers) – Dodo Posters
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https://www.kpcw.org/2013-12-24/first-class-postal-rate-will-rise-to-49-cents-next-month
First-Class Postage Rate Will Rise To 49 Cents Next Month
Aug 21, 2021 - Regulators authorized a temporary 3-cent increase to help the U.S. Postal Service recoup billions of dollars in losses.
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https://www.ijpr.org/2013-12-24/first-class-postage-rate-will-rise-to-49-cents-next-month
First-Class Postage Rate Will Rise To 49 Cents Next Month | Jefferson Public Radio
Dec 25, 2013 - Regulators authorized a temporary 3-cent increase to help the U.S. Postal Service recoup billions of dollars in losses.
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