Columbia subject headings:
Natural gas pipelines--Law and legislation--United States.
Petroleum pipelines--Law and legislation--United States.
Pipelines--Safety regulations--United States.
Harvard subject headings:
Natural gas pipelines--Law and legislation--United States.
Petroleum pipelines--Law and legislation--United States.
Pipelines--Safety regulations--United States
Princeton subject headings:
Natural gas pipelines--Law and legislation--United States.
Petroleum pipelines--Law and legislation--United States.
Pipelines--Safety regulations--United States.