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  1. 1
    by Bot, Peter V. M.
    Published 1992
    Netherlands : Rijksuniversiteit te Groningen, 1992.
    110 p. : ill. ; 24 cm.
  2. 2
    by Lu, Bao-Rong
    Published 1993
    Svalöv : Swedish University of Agricultural Sciences, Dept. of Plant Breeding Research, 1993.
    1 v. (various pagings) : ill., maps ; 25 cm.
  3. 3
    by Hofman, Annelies
    Published 1991
    [Groningen : Rijksuniversiteit Groningen, 1991]
    134 p. : ill., maps ; 24 cm.

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