TY - Generic T1 - Diagnostic indicators of elevated nitrogen deposition Y1 - 2006 A1 - Pitcairn, C.E.R. A1 - Fowler D. A1 - Leith, I.D. A1 - Sheppard, L.J. A1 - Tang, Y.S. A1 - Sutton, M.A. A1 - Famulari D. JF - Environmental Pollution VL - 144 ER -