By S.C. Pearce
By Food and Agriculture Organization of the United Nations
By M. N. Clifford, K. C. Willson
By David H. Nobel, Charles P. Course
By G. M. Craig (Research Fellow, Centre for Agricultural Strategy, University of Reading)
By Dennis S. Hill, J. M. Waller
By J.M. Hodgson
By Roger Balls
By Melvyn Kay
By Raymond A. T. George
By Anne Van den Ban, H.S. Hawkins, A.W. van den Ban
By L. T. Evans
By Pete Brown
By Jackson, Lucy
By John Lewis-Stempel
By Great Britain: Agricultural Development and Advisory Service, J.R. Archer, M.J. Marks
By C.R.W. Spedding, E.C. Diekmahns, Edward Charles Diekmahns, E.C. Dikmahns
By N. W. Pirie
By Chris Graham
By David Dent
By Agriculture, Fish.& Food, Min.of
By Ian G. Walls