Severn Tunnel

1. Vernon-Harcourt, Leveson Francis (1895): Brief Notices of Works. Portland Harbour; The Severn Tunnel; The Forth Bridge; The River Clyde; The River Tyne; The Tower Bridge.. In: Minutes of the Proceedings of the Institution of Civil Engineers, v. 121, n. 1895-3 ( 1895), pp. 303-323.

   https://doi.org/10.1680/imotp.1895.19761

2. Carpmael, R. (1932): Cementation in the Severn Tunnel. In: Minutes of the Proceedings of the Institution of Civil Engineers, v. 234, n. 1932-2 ( 1932), pp. 277-289.

   https://doi.org/10.1680/imotp.1932.13312

3. Walker, Thomas A. (1891): The Severn tunnel: its construction and difficulties, 1872-1887. 3^rd edition, Bentley.
4. Haswell, C. K. (1973): Tunnel under the Severn and Wye Estuaries. In: Proceedings of the Institution of Civil Engineers, v. 54, n. 3 (August 1973), pp. 451-486.

   https://doi.org/10.1680/iicep.1973.4855