A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Use of room and pillar method at St Ellen mine near O'Fallen, Ill; coal averages 78 in. in height and there is from 180 to 210 ft of cover; equipment and its maintenance; reference to management practice.
Use of room and pillar method at St Ellen mine near O'Fallen, Ill; coal averages 78 in. in height and there is from 180 to 210 ft of cover; equipment and its maintenance; reference to management practice.
Mining at perry coal co
Min Congress J
Sall, G.W. (author)
1954
4 pages
Article (Journal)
English
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