Diagrammatic explanation of occurrence of "thrust cleavage" by pressure at working face of coal seam. (see also abstract translation in Colliery Guardian, vol. 142, no. 3667, Apr. 10, 1931, pp. 1282-1283, 3 figs.)
Face pressure and cleat in underground workings
Abbaudruck und Druckschlechten
Glueckauf ; 66 , n 45
1930
2 pages
3 Figs.
Article (Journal)
German
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