1. National Coal Board, Working Under the Sea. Mining Department Instruction PI/1968/8 (Rev. 1971).
2. Effects of Mining on Surface and Sub-Surface Water Biodies;Garritty,1980
3. Effects of Mining Subsidence on the Permeability of Coal Measures Rocks;Neate,1980
4. Effect of longwall mining on ground permeability and sub-surface drainage;Whittaker,1979
5. A reappraisal of investigations into strata permeability changes associated with longwall mining;Aston;Int. J. Mine Water,1983