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Natural gas -- Law and legislation -- Europe	-	3
Natural gas -- Law and legislation	45	181
Petroleum law and legislation -- Europe	-	3
Petroleum law and legislation	116	630
Natural gas	958	2533
Petroleum in submerged lands	143	343
Petroleum in submerged lands -- Europe -- Congresses	-	2
Continental shelf	256	624
Continental shelf -- Europe -- Congresses	-	2
Continental shelf -- Europe	2	3

Subject Heading "Petroleum in submerged lands -- Europe"