Columbia subject headings:
National security--United States.
Sea-power--United States.
Shipbuilding industry--United States.
Ships--United States--Maintenance and repair--Safety measures.
United States--Defenses.
Harvard subject headings:
Shipbuilding industry--Safety regulations--United States.
Ships--United States--Maintenance and repair--Safety measures.
Princeton subject headings:
Shipbuilding industry--Safety regulations--United States.
Ships--United States--Maintenance and repair--Safety measures.