---
kind: "unit"
title: "19"
title_heading: "Customs Duties"
key: "ch22/schI/ptB"
level: "part"
label: "Part B"
heading: "Tariff Modifications"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/19/ch22-schI-ptB"
sections_count: 4
---

# Part B — Tariff Modifications

Title 19 — Customs Duties › Chapter 22 — Uruguay Round Trade Agreements › Subchapter I — Approval of, and General Provisions Relating to, Uruguay Round Agreements

## Sections

- [§3521. Tariff modifications](/usc/19/3521.md)
- [§3522. Liquidation or reliquidation and refund of duty paid on certain entries](/usc/19/3522.md)
- [§3523. Duty free treatment for octadecyl isocyanate and 5-Chloro-2-(2,4-dichloro-phenoxy)phenol](/usc/19/3523.md)
- [§3524. Consultation and layover requirements for, and effective date of, proclaimed actions](/usc/19/3524.md)