Columbia subject headings:
Petroleum--Transportation--Safety regulations--United States.
Tankers--Design and construction--Law and legislation--United States.
Tankers--Safety regulations--United States.
Harvard subject headings:
Petroleum--Transportation--Safety regulations--United States.
Petroleum--Transportation--United States--Safety regulations.
Tankers--Design and construction--Law and legislation--United States.
Tankers--Safety regulations--United States.
Tankers--United States--Safety regulations.
Princeton subject headings: