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2
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Pigs and poultry in the tropics : utilization of local feed resources / by T. R. Preston.
- Technical centre for agricultural and rural co-operation (CTA),
- cop. 1987.
- Wageningen :
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The development of milk production systems in the tropics / by T.R. Preston.
- Technical centre for agricultural and rural co-operation (CTA),
- cop. 1989.
- Wageningen :