Columbia subject headings:
Harvard subject headings:
Great Britain. Royal Navy--Procurement.
Great Britain. Royal Navy--Weapons systems.
Nuclear weapons--Great Britain
Strategic forces--Great Britain.
Trident (Weapons system)
Princeton subject headings:
Great Britain. Royal Navy--Procurement.
Great Britain. Royal Navy--Weapons systems.
Nuclear weapons--Great Britain.
Strategic forces--Great Britain.
Trident (Weapons systems)