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  1. 1
    by Leeuw, Jan de
    Published 1992
    Enschede, The Netherlands : ITC, c1992.
    177 p. : ill., maps ; 24 cm.
  2. 2
    by Milberg, Per
    Published 1993
    Uppsala : Sveriges lantbruksuniversitet, Institutionen för växtodlingslära, 1993.
    1 v. (various pagings) : ill. ; 24 cm.
  3. 3
    by Gunnarsson, Urban
    Published 2000
    Uppsala [Sweden] : Acta Universitatis Uppsaliensis, c2000.
    25 p. : ill., maps ; 25 cm.
  4. 4
    by Poupon, Henri
    Published 1980
    Paris : O.R.S.T.O.M., 1980.
    351 p., [7] folded leaves of plates : ill. ; 28 cm.

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