< United States Code
- Part I—General
- Part II—Personnel
- Part III—Modernization and Fiscal Administration
- Part IV—Mail Matter
- Chapter 30—Nonmailable Matter
- Chapter 32—Penalty and Franked Mail
- Chapter 34—Armed Forces and Free Postage
- Chapter 36—Postal Rates, Classes, and Services
- Part V—Transportation of Mail
- Chapter 50—General
- Chapter 52—Transportation of Mail By Surface Carrier
- Chapter 54—Transportation of Mail By Air
- Chapter 56—Transportation of Mail By Vessel
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