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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Oct 31, 2025
All Titles
Title 27
Chapter I
Part 31
Subpart A - Subpart A—General Provisions
§ 31.1 - Definitions.
§ 31.2 - Territorial extent.
§ 31.3 - Basic permit requirements.
§ 31.4 - Relation to State and municipal law.
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