1. Radon and caving;Ball;SWCC Newsletter,1990
2. Radon risks;Ball;World Tunnelling,1994
3. Speleogenesis in the limestone outcrop north of the South Wales Coalfield;Ball;Cave Science,1990
4. Behaviour of radon in the geological environment;Ball;Quarterly Journal of Engineering Geology,1991
5. How old is Ogof Ffynnon Ddu?;Ball;SWCC Newsletter,1996