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  1. 1
    Published 1981
    Addis Ababa : United Nations, Economic Commission for Africa, 1981.
    vii, 69, 5, 4 p. : ill. ; 27 cm.
  2. 2
    by Hammer, Turi
    Published 1983
    Bergen, Norway : Chr. Michelsen Institute, Development Research and Action Programme, 1983.
    xvi, 124, 12 p. : ill., maps ; 30 cm.
  3. 3
    Published 1981
    Addis-Abéba : Nations Unies, Commission économique pour l'Afrique, 1981.
    viii, 80 p. : ill. ; 28 cm.
  4. 4
    by Hillring, Bengt
    Published 1995
    Garpenberg : Swedish University of Agricultural Sciences, Dept. of Operational Efficiency, Faculty of Forestry, 1995.
    iii, 33, 6 p. ; 30 cm.
  5. 5
    by Gier, Alfred de
    Published 1989
    Enschede : International Institute for Aerospace Survey and Earth Sciences, c1989.
    102, [71] p. : ill. ; 30 cm.
  6. 6
    by Mattsson, Jan Erik
    Published 1989
    Garpenberg : Swedish University of Agricultural Sciences, Faculty of Forestry, Dept. of Operational Efficiency, 1989.
    17 p. : ill. ; 30 cm.

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