Engineering classification of jointed rock masses. discussions of paper by Z.T. Bieniawski, trans. s. afr. instn. civ. engrs. v15, n12, Dec. 1973, and authors reply : 4F, 4T, 39R. Trans. S. Afr. Instn. Civ. Engrs. V16, N7, July, 1974, P239–254

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