Domestic Mail - About.usps.com
https://about.usps.com/postal-bulletin/2006/html/pb22194/pb4a-i_005.html
Web151.11 Stamps by Mail PS Forms 3227-A and 3227-B. The Stamps by Mail (SBM) service allows Postal Service customers on all carrier routes and Post Office boxes to purchase Postal Service products, such as booklets, sheets, and coils of stamps, postal cards, and stamped envelopes by ordering through the mail. The Postal Service order forms are ...
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