AID research and development abstract - Washington, DC: AID Reference Center(US Agency for International Development) - v.p.

Lib/Misc/78/1983-87(wdr no.2871;acc.no.9902)
Lib/Misc/78/1983-87(wdr no.2870;acc.no.9904)
Lib/Misc/78/1983-87(wdr no.2872;acc.no.11775)

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