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Method of bullflex. An entirev new tunnel approach in making steel-rib suopports for roadways more effective : Durrfeld, W A Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3–7 May 1981, V1, P845–858. Publ New York: AIME, 1981


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

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