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устойчивая породаstresses
dril. competent formation
geol. resistant rock; standing ground; hardgrounds (MichaelBurov); stand-up formation
goldmin. competent rock (MichaelBurov)
Makarov. coherent rock; stable rock
mining. good ground; good rock; hard ground; secure rock; self-sustaining rock
OHS cohesive soil
railw. compact rock; solid rock
устойчивая порода: 11 phrases in 5 subjects
Agrochemistry1
Drilling3
Geology1
Mining2
Name of organization4