Columbia subject headings:
Continental shelf--Norway--Congresses.
Geochemical prospecting--North Sea--Congresses.
Offshore oil industry--Norway--Congresses.
Organic geochemistry--North Sea--Congresses.
Petroleum--Geology--North Sea--Congresses.
Harvard subject headings:
Geochemical prospecting--North Sea--Congresses.
Geochemical prospecting--Norway--Congresses.
Organic geochemistry--North Sea--Congresses.
Organic geochemistry--Norway--Congresses.
Petroleum--Geology--North Sea--Congresses.
Petroleum--Geology--Norway--Congresses.
Princeton subject headings:
Geochemical prospecting--North Sea--Congresses.
Geochemical prospecting--Norway--Congresses.
Organic geochemistry--North Sea--Congresses.
Organic geochemistry--Norway--Congresses.
Petroleum--Geology--North Sea--Congresses.
Petroleum--Geology--Norway--Congresses.