By Mariano Turzi
By D. B. Grigg
By Henning Steinfeld, Food and Agriculture Organization
By Jemima Parry-Jones, MBE (Author)
By D. L. Ebbels
By Jasper N. Joiner
By Finch, William R.
By Alain de Janvry
By Noel Kingsbury, Andrea Jones
By Anne Starling, Peter Loosley, Tessa Lovatt Smith
By Jeremy Evans, Sheila Berrett
By William Adams, Richard Gibbs (New Zealand Turf Culture Institute)
By arthur j. simons
By Robert Hart
By Else Hvass, Edward Bertram Anderson
By Natural History Museum
By Donald Broom (Cambridge University, UK), Andrew Fraser (formerly Memorial University of Newfoundland, Canada)
By Norman Hudson
By T. R. Paton
By Brian Witney
By Paul Power
By Hartley, C.W.S.
By Grist, D. H.
By Wood BA DTA, G. A. R., Lass B.Sc. DTA, R. A.
By Munro, J. M.
By Webster, C. C., Baulkwill, W. J.
By Samson, J. A.
By Wrigley, Gordon
By Purseglove, John William, Green, C L, Brown, D.G., Robbins, S.R.J.