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Shaft sinking concepts and two independent systems of concurrent development through the shafts being sunk : Nel, P J L Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3–7 May 1981, V2, P976–995. Publ New York: AIME, 1981


Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
116 KB
Volume
19
Category
Article
ISSN
0148-9062

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