Columbia subject headings:
Hazardous substances--Transportation--Safety regulations--United States.
Natural gas pipelines--Law and legislation--United States.
Natural gas pipelines--United States--Safety measures.
Pipelines--United States--Safety measures.
United States. Pipeline Safety Improvement Act of 2002.
United States. Pipeline and Hazardous Materials Safety Administration.
Harvard subject headings:
Hazardous substances--Transportation--Safety regulations--United States.
Natural gas pipelines--Law and legislation--United States.
Natural gas pipelines--United States--Safety measures.
Pipelines--United States--Safety measures.
United States. Pipeline Safety Improvement Act of 2002.
United States. Pipeline and Hazardous Materials Safety Administration.
Princeton subject headings:
Hazardous substances--Transportation--Safety regulations--United States.
Natural gas pipelines--Law and legislation--United States.
Natural gas pipelines--United States--Safety measures.
Pipelines--United States--Safety measures.
United States. Pipeline Safety Improvement Act of 2002
United States. Pipeline and Hazardous Materials Safety Administration