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природный газ коллекторов stresses
O&G	NAG (газа), свободный газ (non-associated gas Углов)
O&G. tech.	non-associated gas
tech.	unassociated gas (газа)

природный газ коллекторов: 10 phrases in 5 subjects

Makarov	1
Oil / petroleum	3
Oil and gas	3
Oil and gas technology	1
Technology	2