By Brenda Maddox
By Tim Marshall
By George W. Cox
By Knowles, Professor Richard, Wareing, J.
By Sir David Attenborough
By Ray Feltwell
By Peter Holden, J. T. R. Sharrock
By Bill Bryson, Bryson, Bill
By Peter Senge
By Arjen E.J. Wals
By Berkeley Hill (Imperial College, University of London, UK)
By Hans Langeveld, Niels Roeling
By Nigel Boatman
By G. J. Jellis, D. E. Richardson
By N.T. Gill, K.C. Vear
By Graham Russell (University of Edinburgh), Bruce Marshall (Scottish Crop Research Institute, Dundee), Paul G. Jarvis (University of Edinburgh)
By C.F.H. Bishop, W. Maunder
By Carroll Fenton
By J. G. Hawkes
By J. H. M. Thornley
By G.V. Dyke
By Alastair H. Fitter (University of York, U.K.), Robert K.M. Hay (Scottish Agricultural Science Agency, EDINBURGH, Scotland)
By K. J. Boote, J.M. Bennett, T.R. Sinclair, K. J Boote, G.M. Paulsen
By Bahn, Paul, Tidy, Bill
By Mathew Lawrence, Laurie Laybourn-Langton
By Alan E. Brafield, Michael J. Llewellyn
By Cloudsley-Thompson, J.L.
By Sarah Callard, Diane Millis
By Tree, Isabella
By Vargic, Martin, Vargic, Martin