A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
What the coal miner can do to prevent injury from falls of roof
Working conditions and recommendations for safe practice.
What the coal miner can do to prevent injury from falls of roof
Working conditions and recommendations for safe practice.
What the coal miner can do to prevent injury from falls of roof
U. S. Bur. Mines -- Information Cir
Paul, J.W. (author)
1930
4 pages
Report
English
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