...the Severn and Wye estuaries. -Description of problems...
Tunnel under the Severn and Wye estuaries. -Description of problems, rock conditions, water inflows etc. encountered during tunnelling and how they were overcome. Figs, Tabls : Haswell, CK Proc. Instn. Civ. Engrs. V54, Aug. 1973, P451–486...