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Green manure/cover crop systems of smallholder farmers : experiences from tropical and subtropical regions / ed. by Marjatta Eilittä, Joseph Mureithi and Rolf Derpsch.
- Kluwer Academic,
- cop. 2004.
- Dordrecht [etc.] :
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Forest entomology in West tropical Africa : forest insects of Ghana / Michael R. Wagner, Stephen K.N. Atuahene and Joseph R. Cobbinah.
- Kluwer,
- 1991.
- Dordrecht [etc.] :
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East Africa's grasses and fodders : their ecology and husbandry / Joseph G. Boonman.
- Kluwer Academic,
- cop. 1993.
- Dordrecht [etc.] :