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A platform for research: civil engineering, architecture and urbanism
Timber withdrawing and devices used for this purpose in some coal mines
Timbers are withdrawn in coal mines for purposes of roof control, for recovery of timber for further use in some form, and as precaution against fire; information in paper has been abstracted and compiled from data in Bureau of Mines reports on study of roof in mines operating in Pittsburgh coal bed in western Pennsylvania, Ohio, and West Virginia.
Timber withdrawing and devices used for this purpose in some coal mines
Timbers are withdrawn in coal mines for purposes of roof control, for recovery of timber for further use in some form, and as precaution against fire; information in paper has been abstracted and compiled from data in Bureau of Mines reports on study of roof in mines operating in Pittsburgh coal bed in western Pennsylvania, Ohio, and West Virginia.
Timber withdrawing and devices used for this purpose in some coal mines
U S Bur Mines -- Information Cir
Paul, J.W. (author) / Calverley, J.G. (author)
1933
14 pages
Report
English
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