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Die sicherheit im Felsbau = Safety in Rock Engineering : XV Kolloquium der Osterreichischen Regionalgruppe (i.Gr.) der Internationalen Gesellschaft fur Felsmechanik = 15 Symposium of the Austrian Regional Group (i.f.) of the International Society for Rock Mechanics Salzburg, 24-25 September 1964 / edited by L. Muller ; in cooperation with C. Fairhurst - Wien : Springer-Verlag, 1965 - 155 p. : ill., grafici, alcune foto ; 25 cm. - Felsmechanik und Ingenieurgeologie = Rock mechanics and Engineering Geology ; supplementum II .