Curtis, CJ; Allott, TEH; Bird, D; Hall, J; Harriman, R; Helliwell, R; Kernan, M; + view all (1998) Critical loads of sulphur and nitrogen for freshwaters in Great Britain and assessment of deposition reduction requirements with the First-order Acidity Balance (FAB) model. (ECRC Research Paper 16 , pp. pp. 1-28 ). UCL Environmental Change Research Centre: London, UK. Green open access