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Related Headings
Petroleum pipeline industry -- Europe	-	3
Petroleum pipeline industry	7	14
Petroleum pipeline industry -- United States	-	11
Natural gas pipelines	262	356
Natural gas pipelines -- United States	16	55
Petroleum pipelines -- Europe	1	7
Petroleum pipelines	191	301
Petroleum pipelines -- United States	4	40
Ukraine	3082	23237
Russia (Federation)	3800	35802

Subject Heading "Natural gas pipelines -- Europe"