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First-Class Mail & Postage | USPS
Postage Rates & Prices | USPS
Types of First-Class Mail® - USPS
Types of First-Class Mail® - USPS
Mail Classes Comparison Chart - Domestic & International - USPS
First-Class Mail - Postal Explorer
Retail Postage Price Calculator
Current Postage Rates, US Postage Stamp Prices - Stamps.com
Stamps | First-Class Mail | USPS.com
What is the difference between first class mail and regular mail?