International symposium on underground openings = Internationales symposium fur untertagbau : proceedings, Lucerne, Sept. 11-14, 1972 / edited by H. Grob and K. Kovari
International symposium on underground openings = Internationales symposium fur untertagbau : proceedings, Lucerne, Sept. 11-14, 1972 / edited by H. Grob and K. Kovari - - Zurich : Swiss Soc. for Soil Mech. & Found. Engg., - 573 p. 24 cm - .
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Underground construction-Congresses
Tunneling-Congresses
624.19 Int:72