1. Ratcliffe, R. A. S., Weather 31, 271 (1976).
2. British Rainfall, 1887.
3. British Rainfall, 1961.
4. Rodda, J. C. Water and Water Engineering 69, 316 (1965).
5. Rodda, J. C., Downing, R. A. & Law, F. M. Systematic Hydrology (Newnes-Butterworths, London 1976).