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  1. 1
    by Dueck, Thomas Albert
    Published 1987
    Amsterdam : Free University Press, 1987, 1986.
    160 p. : ill. ; 24 cm.
  2. 2
    by Wit, Toke de
    Published 1976
    Vaduz, Switzerland : J. Cramer, 1976.
    226 p. : ill. ; 23 cm.
  3. 3
    by Oene, Harmke van
    Published 1994
    Uppsala : Sveriges lantbruksuniversitet, Institutionen för ekologi och miljövård, 1994.
    1 v. (various pagings) : ill. ; 24 cm.
  4. 4
    by Kropff, M. J.
    Published 1989
    [Wageningen, The Netherlands? : Landbouwuniversiteit te Wageningen, 1989?]
    201 p. : ill. ; 24 cm.
  5. 5
    by Saxe, Henrik
    Published 1990
    [Denmark : s.n., 1990]
    1 v. (various pagings) : ill. ; 30 cm.

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