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  1. 1
    by Zwartz, Judith A.
    Published 1967
    Wageningen, H. Veenman & Zonen, 1967.
    144 p. with illus. 25 cm.
  2. 2
    by Malmberg, Alf
    Published 1984
    Uppsala, Sweden : Swedish University of Agricultural Sciences, Dept. of Chemistry and Molecular Biology, 1984.
    ca. 74 p. in various pagings : ill. ; 30 cm.

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