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  1. 1
    by Schjørring, Jan K.
    Published 1998
    Copenhagen : Plant Nutrition and Soil Fertility Laboratory, Dept. of Agricultural Sciences, Royal Veterinary and Agricultural University, 1998.
    1 v. (various pagings) : ill. ; 25 cm.
  2. 2
    by Svedäng, Maria
    Published 1991
    Uppsala : Stockholm, Sweden : Uppsala University ; Distributor, Almqvist and Wiksell International, 1991.
    14 p. : ill. ; 25 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 Wei, Shiqiang
    Published 1999
    Uppsala : Swedish University of Agricultural Sciences, 1999.
    1 v. (various pagings) : ill. ; 24 cm.

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