By Charles B. Heiser
By Leonard G. Copping
By C. Spedding
By Joan Thirsk (former President, former President, British Agricultural History Society)
By J. Janick, etc.
By Joyce, P.M., etc., Walsh, Wendy
By Larry L Strand
By George Constantine Papavizas
By Amos Navon (Department of Entomology, Agricultural Research Organization, Bet Dagan, Israel), K Ascher (Department of Entomology, Agricultural Research Organi...
By G. Gurr, Jeff Waage, S.D. Wratten
By Ken Simpson
By R. Lal, D. J. Greenland
By A Draycott (Formerly of Broom's Barn Research Station, Suffolk, UK), Donald Christenson (Professor Emeritus, Department of Crop and Soil Sciences, Michigan State University, USA)
By Daniel Hillel
By Dregne, Harold E.
By Great Britain: Forestry Commission
By S.M. Jain, S.C. Minocha
By A. Schafer-Menuhr
By A.J Abbott, R. K. Atkin
By Indra K. Vasil, etc.
By H. T. Stalker (North Carolina State University, USA), J Murphy
By Carlos A. Neyra
By Ken Cockshull, D. Gray, Professor Brian Thomas (University of Warwick, UK)
By John Keith Syers, A. E. Johnston, Denis Curtin
By Louis G. Nickell
By M H Zimmermann
By J. Goudriaan, H.H. Van Laar
By Landon, J. R.
By F.W.G. Baker