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3
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Weed control practices in citrus, cotton and rice / P.J. van Rijn.
- Royal tropical institute. Department of agricultural research,
- 1972.
- Amsterdam :
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Characteristics of weeds / by P.J. van Rijn.
- Royal tropical institute. Department of agricultural research,
- 1972.
- Amsterdam :
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Noxious weeds : lecture on October 16th 1972, International course on plant protection, Wageningen / P.J. van Rijn.
- Royal tropical institute. Department of agricultural research,
- 1972.
- Amsterdam :