A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study of roof in Pennsylvania mines contiguous to Monongahela river
Continuation from Tech Paper n 541; study at 7 mines in 3 counties in southwestern Pennsylvania; during period for which definite data were furnished, 12,142, 889 tons of coal were produced; 27 men killed underground, 23 of these from falls of roof or coal; 1584 lost-time injuries, of which 480 resulted from falls of roof or coal.
Study of roof in Pennsylvania mines contiguous to Monongahela river
Continuation from Tech Paper n 541; study at 7 mines in 3 counties in southwestern Pennsylvania; during period for which definite data were furnished, 12,142, 889 tons of coal were produced; 27 men killed underground, 23 of these from falls of roof or coal; 1584 lost-time injuries, of which 480 resulted from falls of roof or coal.
Study of roof in Pennsylvania mines contiguous to Monongahela river
U S Bur Mines -- Tech Paper
Paul, J.W. (author) / Calverley, J.G. (author)
1933
31 pages
Report
English
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| Engineering Index Backfile | 1908
Navigation conditions at locks and dam no. 4 Monongahela river, Pennsylvania
| Engineering Index Backfile | 1966