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крепкий песчаникstresses
construct. quarr
geophys. competent sandstone
mining. quarr (каменноугольный)
oil quar
крепкий песчаник каменноугольный'
dril. quar
крепкий песчаник: 5 phrases in 3 subjects
Oil / petroleum2
Oil and gas2
Oilfields1