Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Questions and answers on timbering bituminous coal mines
About one half fatal accidents in bituminous coal mines come from falls of roof and coal; about 85 per cent of such occur at or near working faces; questions and answers prepared to bring simplified timbering practice to attention of miners and timbering crews.
Questions and answers on timbering bituminous coal mines
About one half fatal accidents in bituminous coal mines come from falls of roof and coal; about 85 per cent of such occur at or near working faces; questions and answers prepared to bring simplified timbering practice to attention of miners and timbering crews.
Questions and answers on timbering bituminous coal mines
U.S. Bur Mines -- Miners' Circular
Paul, J.W. (Autor:in)
1928
32 pages
31 Figs.
Aufsatz (Zeitschrift)
Englisch
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Some information on timbering bituminous-coal mines
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