P 1.1: Annual Report 1823-
P 1.2: General Publications
P 1.3: The Postal Bulletin
P 1.3/2: Postal Inspection Service Bulletin
P 1.8: Advertisments Inviting Proposals for Carrying Mail
P 1.9: Postal Treaties and Conventions
P 1.10/4: Directory of Post Offices, 1955-
P 1.10/5: International mail manual (IMM)
P 1.10/6: County List of Post Offices
P 1.10/8: National Five Digit Zip Code and Post Office Directory
P 1.10/9: Zip+4 Code State Directories
P 1.11/3: Postal Laws
P 1.12/5 a: Instructions for Mailers
P 1.12/7: Employee and Labor Relations Manual (ELM)
P 1.12/10: Administrative Support Manual
P 1.12/11 Domestic Mail Manual
P 1.21 Schemes for Separation of Mail by States
P 1.29/2: Law Enforcement Report / Postal Inspection Service
P 1.31/4: Handbooks, Manuals, Guides
P 1.31/5: Personnel Handbooks, P 1-
P 1.34: Telephone Directory
P 1.47: Memo to Mailers
P 1.47/2: The Mailroom Companion
P 1.48: Competitors and Competition of the U.S. Postal Service
P 1.52: Directories
P 1.52/2: Express Mail Next Day Service
P 1.54: Mint Set of Commemorative Stamps
P 1.54/2: Mint Set of Commemorative Stamps
P 1.55: Notices (series)
P 1.56: Disabled Veterans Affirmative Action Plan
P 1.57: Publication (series)
P 1.58: National Electronic Catalog
P 1.60: Postal Facts
P 4.10: Postage Stamps of the United States 1927-
P 10.13: Postal Laws and Regulations, Seniority Rules, Service Rating System and Space Rulings Applicable to the Railway Mail Service
P 19.1: Annual Reports