CFR > Title 33 > Chapter I > Subchapter S > Part 181 > Subpart A CFR > Title 33 > Chapter I > Subchapter S > Part 181 > Subpart A – General Current as of: 2024 | Check for updates | Other versions § 181.1 Purpose and applicability; preemptive effect § 181.3 Definitions § 181.4 Incorporation by reference