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Prevention of roof falls in coal mine entries
Announcement of study to be made by Committee on Roof Action; causes of roof falls; investigation of roof spalling.
Prevention of roof falls in coal mine entries
Announcement of study to be made by Committee on Roof Action; causes of roof falls; investigation of roof spalling.
Prevention of roof falls in coal mine entries
Min Congress J
Southward, G.B. (author)
1941
Article (Journal)
English
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