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2
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Impact indicators for measuring change in the natural resource base / by Ralph J. McCracken.
- US. Agency for international development,
- 1989.
- Washington, DC :
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Review of the quality of A.I.D. evaluations FY 1987 and FY 1988 / by Paul J. Hopstock, Allan C. Kellum, Malcolm B. Young.
- US. Agency for international development,
- 1989.
- Washington, DC :