1. Allen DJ Brewerton LJ Coleby LM Gibbs BR Lewis MA MacDonald AM Wagstaff SJ Williams AT 1997 The physical properties of the major aquifers in England and Wales British Geological Survey Technical
2. The sealing of soils by manure. I. Preliminary investigations;Barrington;Canadian Agricultural Engineering 29,1987
3. Chilton PJ Williams AT Marks RJ Smedley PL Buckley DK Merrin PD 1999 Groundwater nitrate concentrations in the Sherwood sandstone aquifer of South Yorkshire British Geological Survey
4. Centrifuge extraction and chemical analysis of interstitial waters;Edmunds;Environmental Science and Technology,1976