%0 Report %D 1994 %T Scotland's soils: Research issues in developing a soil sustainability strategy %A Billett, M.F. %B Scottish Natural Heritage Review 13 %I Scottish Natural Heritage %C Perth %P 25-29 %0 Generic %D 1993 %T Observations on the changes in nitrate concentrations in seven upland moorland catchments in north eastern Scotland %A Black, K.E. %A Lowe, J.A.H. %A Billett, M.F. %A Cresser, M.S. %B Water Research %V 27 %P 1195-1199 %0 Journal Article %J Journal of Soil Science %D 1990 %T Forest soil chemical changes between 1949/50 and 1987 %A Billett, M.F. %A Parker-Jervis, F. %A FitzPatrick, E.A. %A Cresser, M.S. %B Journal of Soil Science %V 41 %P 133-135 %0 Journal Article %J Soil Use and Management %D 1988 %T Long term changes in the acidity of forest soils in north east Scotland %A Billett, M.F. %A FitzPatrickm, E.A. %A Cresser, M.S. %B Soil Use and Management %V 4 %P 102-107