By Alan Weisman
By Professor Brian Cox, Andrew Cohen, Cox, Professor Brian, Cohen, Andrew
By Smith, Alec James
By Feibleman, Peter, the editors of Time-Life Books, Time-Life Books, of
By Williams, Richard
By Walker, Bryce S., the editors of Time-Life Books, Time-Life Books, of
By Stewart, Robert, the editors of Time-Life Books
By Moser, Don, the editors of Time-Life Books, Time-Life Books, of, Rentmeester, Co
By Bruce Brown, Lane Morgan
By Michael Allaby
By Svrcek, Mirko, Coxon, D.
By David Evans, Douglas Benn
By Embleton, Clifford, King, Cuchlaine A.M.
By Pretty, Jules N., Guijt, I, Thompson, J., Scoones, I
By Valigi, Cinzia
By Alexander High Lawson
By Great Britain: Agricultural Development and Advisory Service, J.R. Archer, M.J. Marks
By Grime, J. Philip, J. Philip Grime
By O. H. Frankel, J. G. Hawkes
By C.R.W. Spedding, E.C. Diekmahns, Edward Charles Diekmahns, E.C. Dikmahns
By N. W. Pirie
By Food and Agriculture Organization of the United Nations
By Alun Rocyn Rees, etc.
By Walker, Michael J.
By F.R. Dobson, H.E. Virgo