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Kemerovo Branch, IPK, Ministry of the Coal Industry of the USSR. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, January–February, 1974.
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Ermolaev, A.M. Caving of roof rocks during working of gently sloping coal seams with mechanized OMKTM systems. Soviet Mining Science 10, 93–96 (1974). https://doi.org/10.1007/BF02501615
- Coal Seam
- Roof Rock
- Main Roof
- Roof Material