The second volume of the Title 49 of the Code of Federal Regulations, available in digital and printed form and can be referenced offline using the (e-CFR), tackles the Pipeline and Hazardous Materials Safety Administration, Department of Transportation; while the sixth volume tackles the Coast Guard, Department of Homeland Security.
2 Pipeline and Hazardous Materials Safety Administration, Department of Transportation 6 Coast Guard, Department of Homeland Security This title is available in digital and printed form, and can be referenced online using the (e-CFR). 
