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Increasing roof stability in the room-and-pillar system
K. S. Salykov, A. I. Imangaliev, V. Kh. Koshumov, L. I. FreiVolume:
9
Language:
english
Pages:
2
DOI:
10.1007/bf02502122
Date:
January, 1973
File:
PDF, 165 KB
english, 1973