Columbia subject headings:
Petroleum in submerged lands--Great Britain.
Petroleum in submerged lands--North Sea.
Petroleum--Geology--Great Britain.
Petroleum--Geology--North Sea.
Harvard subject headings:
Princeton subject headings:
Petroleum in submerged lands--Great Britain.
Petroleum in submerged lands--North Sea.
Petroleum--Geology--Great Britain.
Petroleum--Geology--North Sea.