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Code of Federal Regulations - Title 37 - Patents, Trademarks, & Copyrights..
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Code of Federal Regulations - Title 45: Parts 1-199 - Public Welfare..
Code of Federal Regulations - Title 23: 1-1399 - Highways (Federal Highway Administration)..
Code of Federal Regulations - Title 40: Part 50 - Part 51 - Protection of the Environment..