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  1. 1
    by Blaikie, Piers
    Published 1989
    Analytics

    Environment and access to resources in Africa
  2. 2
    by Carpenter, Richard A.
    Published 1989
    Analytics

    Do we know what we are talking about?
  3. 3
    by Pimentel, David, Allen, J.
    Published 1987
    Analytics

    World agriculture and soil erosion erosion threatens world food production
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