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| 100 |
_aWijewardene, Ray _eaut |
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_awaidyanatha, Parakrama. _eaut |
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_aSystems, teghniques and tools Conservation farming _c/Ray Wijewardene, Parakrama waidyanatha |
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_aColombo _bDepartment of Agriculture _c1984 |
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| 300 | _av, 38 p. | ||
| 509 | _aNS | ||
| 942 | _cPR | ||