@article {621,
	title = {An empirical map of acidity for soils in Great Britain},
	volume = {90},
	year = {1995},
	pages = {301-310},
	author = {Hornung, M. and Bull, K.R. and Cresser, M.S. and Hall, J. and Langan, S.J. and Loveland, P.J. and Smith, C.}
}
