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Value of trees in the small-scale farming sector of Zimbabwe / B.M. Campbell, S.J. Vermeulen, and T. Lynam ; in collab. with K.W. Nyamapfene...[et al.].
- IDRC,
- 1991.
- Ottawa :
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The global cash crunch : an examination of debt and development / [Frank A. Campbell].
- International development research centre (IDRC),
- 1992.
- Ottawa :