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Foliar diagnosis, nutrition and yield stability of black peper (Piper nigrum L) in Sarawak / by P.W.F. de Waard.
- Royal tropical institute. Department of agricultural research,
- 1969.
- Amsterdam :
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Kola : its botany and cultivation / by C.L.M. van Eijnatten.
- 862
- Royal tropical institute. Department of agricultural research,
- 1969.
- Amsterdam :