proceedingns International Conference on Options for Strengthening National and Regional Seed Systems in Africa and West Asia (1997 : Harare, Zimbabwe) creator Bishaw, Z. ed. Gastel, A.J.G. van ed. Rohrbach, D. D. ed. text ii Patancheru International Crops Research Institute for the Semi-Arid Tropics 1997 1997 monographic eng 281 p. : gráfs. /ed. by D. D. Rohrbach, Z. Bishaw and J. G. van Gastel Semillas Preservación Semillas Producción 631.521 I59 9290663804 78471 990625 20220329142112.0