Part IV — Mail Matter

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• Ch. 30 Nonmailable Matter §§3001 to 3018
• Ch. 32 Penalty and Franked Mail §§3201 to 3220
• Ch. 34 Armed Forces and Free Postage §§3401 to 3406
• Ch. 36 Postal Rates, Classes, and Services §§3621 to 3692
• Ch. 37 Nonpostal Services §§3701 to 3705