Site investigation procedures adopted for the Northumbrian water authority's tyneside sewerage scheme, with special reference to settlement prediction when tunnelling through urban areas : Norgrove, W B; Cooper, I; Attewell, P B In: Tunnelling '79, Proceedings of the 2nd International Symposium, London, 12–16 March 1979, P79– 104. Publ London: IMM, 1979