1. Anderson, J. G. C. & Trigg, C. F. 1976. Tip failures in South Wales. Chapter 8, Case Histories in Engineering Geology, Elek Science, London.
2. Anon. 1898. Western Mail newspaper, 4 November, p5.
3. Anon. 1909. Rhondda Leader newspaper, 13 February, p8, p10.
4. Anon. 1910a. Western Mail newspaper, 17 December, p7.
5. Anon. 1910b. Western Mail newspaper, 19 December, p6, p8.