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National Geographic : 1977 Apr
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Derrick symbol denotes petroleum field; red, oil, and blue, gas. Soundingsinfeet KILOMETERS too ta o STATUTEMILES 100 DRAWNBY LEOB. ZEBARTH COMPILEDBY GUS PLATIS NATIONALL GEOGRAPHICART DIVISION NORWAY Oslo an *ge o0 SHgg When the pie was sliced in 1958 to establish national rights, the North Sea's vast reserves were only guessed at. The first indication came in 1959 with the discovery of a large natural-gas field in the Netherlands' Groningen Province. Even so, the offshore boom was slow to start. During the next decade gas fields were explored and har nessed, but not until 1969 was there a major oil strike. The North Sea reserves may prove to total 23 billion barrels, ninth largest in the world. Striking It Rich in the North Sea BRITIH SECTOR i. t& 525
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