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A - Subpart A—Overview and Applicability

B - Subpart B—Emission Standards and Related Requirements

C - Subpart C—Certifying Vehicle Families

D - Subpart D—Testing Production Vehicles and Engines

E - Subpart E—In-Use Testing

F - Subpart F—Test and Modeling Procedures

G - Subpart G—Special Compliance Provisions

H - Subpart H—Averaging, Banking, and Trading for Certification

I - Subpart I—Definitions and Other Reference Information