Columbia subject headings:
Lighterage--Environmental aspects.
Oil spills--Risk assessment.
Petroleum--Transportation--Environmental aspects.
Tankers--Safety measures.
Harvard subject headings:
Cargo handling--Safety measures.
Lighterage--United States.
Oil spills--Environmental aspects--United States.
Oil spills--Risk assessment--United States.
Tankers--Loading and unloading--United States.
Princeton subject headings: