✦ LIBER ✦

High speed tunnelling : Symposium on mining methods, Harrogate, 30–31 October and 1 Nov. 1974. Abstract. Min. Engr. V133, N164, July, 1974, P470

✍ Scribed by P.G. Tregelles; J.N. Woodley

No coin nor oath required. For personal study only.

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