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Postal Periodicals and Publications  
Your official source for Postal Service directives.
Handbooks
Manuals
Interim Internal Purchasing Guidelines
Supplying Principles and Practices [PDF] | [HTML]
MailPro
Postal Bulletin
Publications
Kits
Notices
Posters
Signs
Labels
Management Instructions
A Customer's Guide to Mailing
An Introduction to Mailing for Businesses and Organizations