1. Agricultural Development and Advisory Service , 1973 . Mountain Pasture improvement and the integration scheme with the Forestry Commission - the Blaenmyherin scheme . In:Pwllperian Experimental Husbandry FarmAnnual Report, 1973, pp.40 -43 .
2. Potential Aquifer Pollution from Nitrate Leaching Following the Plowing of Temporary Grassland
3. R.W. Collingwood, 1981 .Lake Vyrnwy Estate land use study. An unpublished report prepared for the Severn-Trent Water Authority and Water Research Centre, Shrewsbury.
4. Tipping bucket gauges for measuring run-off from experimental plots