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Experiences of Lake Superior iron range operators with methods involving roof bolts, conventional timber, rigid steel supports, yielding steel arches, and concrete.
Experiences of Lake Superior iron range operators with methods involving roof bolts, conventional timber, rigid steel supports, yielding steel arches, and concrete.
Ground support in bulk mining
Min Congress J
Edwards, R.W. (Autor:in)
1957
Aufsatz (Zeitschrift)
Englisch
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