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240 First-Class Mail International | Postal Explorer
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USPS Shipping Template, Mail Measure, Mail Sizer, Slot Template, Letter Envelope Size Guide, Measuring tool for USPS letter flat large envelope : Amazon.co.uk: Stationery & Office Supplies
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USPS First Class Template Size Guide Ruler Measuring Tool Postal Slot Gauge Large Envelope Shipping Tool - Etsy
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USPS Flat Rate Shipping
USPS Shipping Template, Mail Measure, Mail Sizer, Slot Template, Letter Envelope Size Guide, Measuring tool for USPS letter flat large envelope : Amazon.co.uk: Stationery & Office Supplies
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240 First-Class Mail International | Postal Explorer
U.S. Postal Service on X: "Packages more than 13 oz & bearing only postage stamps must be presented to a postal employee at a retail counter. http://t.co/dp0pbmWefM" / X
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International Mail Services & Shipping Rates | USPS
What Priority Mail Flat Rate® Envelopes Are Available?
