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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 50
Chapter I
Part 21
Subpart A - Subpart A—Introduction and General Requirements
§ 21.2 - Purpose of this part.
§ 21.4 - Scope of regulations.
§ 21.5 - Disqualifying factors.
§ 21.6 - Definitions.
§ 21.8 - Information collection requirements.
§ 21.10 - General permit requirements.
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