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How to Send a Letter or Postcard: Domestic - USPS.com
Postage Rates & Prices | USPS
First-Class Mail & Postage | USPS
USPS.com FAQs
How to Send a Letter, Mailing a Letter - Stamps.com
3 Ways to Put a Stamp on an Envelope - wikiHow
How to Mail a Letter - National Postal Museum
How to Mail a Letter or Postcard the Correct Way - wikiHow
How Many Forever Stamps for an International Letter?
Current Postage Rates, US Postage Stamp Prices - Stamps.com