1. History of the Brecknockshire Agricultural Society, 1755–1955, Part II;EDMUNDS;Brycheiniog,1957
2. EMERY, F. V., (1965), A note on the sheep-cattle ratio in Snowdonia. Symposia in Agricultural Meteorology, Memorandum No. 8, pp. 54–55, Aberystwyth.
3. Two centuries of rain;GLASSPOOLE;Met. Mag.,1928
4. JONES, E. L., (1964), Seasons and Prices. London.
5. What can we find out about the trend of our climate?;LAMB;Weather,1963