by United States Postal Service
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U.S. Postal Service official zone chart
Follow-up report on the 1978 field manag...
International postal rates and fees
Presort first-class mail
Presorting the first-class way
The Postal Service guide to U.S. stamps
U.S. Postal Service
Postal service
Instruction booklet for mailers of third...
Third-class mail matter
Providing for additional writing or prin...