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Code of Federal Regulations - Title 49 Part 186 - Part 199 (Pipeline Safety)..
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Code of Federal Regulations - Title 40 CFR Parts 136-149; Volume 23, Water Programs..
Code of Federal Regulations - Title 40 CFR Parts 790-END; Toxic Programs..
Code of Federal Regulations - Title 48: Chapter 2 - Parts 201-299 - Federal Acquisition Regulations..