"historical geology" . . "Erdölgewinnung." . . "Petroleum North Sea." . . "Olieindustri" . . "Erdgaslagerstätte." . . "Økonomisk geologi" . . "petroleum" . . "Petroleum." . "Noordzee." . . "Natural gas." . . . . . . . . . . "North Sea oil, the great gamble" . . . . . . . . . . . . . . "Estʹ li neftʹ v Severnom more?" . . . . . . . . . "North Sea oil - the great gamble. [With plates, illustrations, and maps.]"@en . . "North Sea oil : the great gamble" . . . . "North sea oil : the great gamble" . . . . . "North Sea Oil, the great gamble" . . "North Sea oil. The great gamble. [With plates.]" . . "North Sea oil. The great gamble. [With plates.]"@en . "North Sea oil - the great gamble" . . . . . . . . . "Est'li neft' v Severnom more?" . . "North Sea oil--the great gamble" . "North Sea oil--the great gamble"@en . . . . . "North Sea oil-the great gamble"@en . . . "North sea oil. the great gamble" . . . . . "Atlantic Ocean" . . "Olie" . . "petroleum engineering" . . "Erdgasgewinnung." . . "Oliewinning." . . "Natural gas North Sea." . . "Nordsee" . . "Nordsee." . "Erdgasgeologie." . . "Offshore-Vorkommen." . . "Erdölgeologie." . . "Erdöllagerstätte." . . "Offshore oil well drilling." . . "Nordsøen" . .