Excerpts
Federal Regulations (CFR), Publication 52 is a regulation of the Postal Service, and changes to it may be published in the
Federal Register
. 39 CFR 211.2(a)(2). Moreover, Publication 52 is incorporated by reference into
Mailing Standards of the United States Postal Service,
Domestic Mail Manual (DMM) section 601.8.1, which is incorporated by reference, in turn, into the Code of Federal Regulations. 39 CFR 111.1 and 111.3. Publication 52 is publicly available, in a read-only format, via the Postal Explorer® website at
https://pe.usps.com