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  1. 1
    by Gebre-Amlak, Assefa
    Published 1988
    Uppsala : Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, 1988.
    1 v. (various pagings) : ill. ; 24 cm.
  2. 2
    by Habtewold, Tibebu
    Published 1993
    Uppsala : Dept. of Plant and Forest Protection, Swedish University of Agricultural Sciences, 1993.
    1 v. (various pagings) : ill., map ; 24 cm.

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