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Large permanent underground openings : proceedings of the international symposium held in Oslo 23-25 september 1969 | Bok | 624.19(061.3) Sy Symposium on large permanent underground openings (1969 : Oslo) / - Oslo : Univeritetsforlaget, 1970. - 372 s. - Språk: Flerspråklig | Symposium on large permanent underground openings | 1970 |