. . "Marine Bouguer anomaly maps." . . "North Sea." . . . . . . . . . . . . "1: 1 000 000 northern North Sea Bouguer gravity map"@en . "1:1 000 000 northern North Sea Bouguer anomaly gravity map" . . . . . . . "1:1000000 northern North Sea Bouguer anomaly gravity map"@en . "1:1000000 northern North Sea Bouguer anomaly gravity map" . "Maps"@en . .