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Postage Rates & Prices | USPS
First-Class Mail & Postage | USPS
Retail Postage Price Calculator Weight and Shape/Size - USPS
Mail & Shipping Services | USPS
How to Send a Letter or Postcard: Domestic - USPS.com
Types of First-Class Mail® - USPS
Envelopes | USPS.com
Parcel Size, Weight & Fee Standards - USPS
Priority Mail | USPS
Priority Mail Flat Rate® Envelope | USPS.com