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Food and Agriculture Organization of the United Nations ,  [Plant Genetic Resources Newsletter: No. 27, February 1972] ,  Plant Genetic Resources Newsletter: No. 27, February 1972

International Board for Plant Genetic Resources ,  Food and Agriculture Organization of the United Nations ,  [Plant Genetic Resources Newsletter: No. 37, March 1979] ,  Plant Genetic Resources Newsletter: No. 37, March 1979

International Plant Genetic Resources Institute ,  [Newsletter for Sub-Saharan Africa: No. 12 December 1999] ,  Newsletter for Sub-Saharan Africa: No. 12 December 1999

Food and Agriculture Organization of the United Nations ,  [Plant Genetic Resources Newsletter: No. 31, September 1975] ,  Plant Genetic Resources Newsletter: No. 31, September 1975

International Plant Genetic Resources Institute ,  [Boletín de las Américas: Volumen 4, No.1, Noviembre 1998] ,  Boletín de las Américas: Volumen 4, No.1, Noviembre 1998

International Plant Genetic Resources Institute ,  [Bulletin pour l'Afrique Subsaharienne: No. 13 Mai 2000] ,  Bulletin pour l'Afrique Subsaharienne: No. 13 Mai 2000

International Plant Genetic Resources Institute ,  [Bulletin pour l'Afrique Subsaharienne: No. 12 Décembre 1999] ,  Bulletin pour l'Afrique Subsaharienne: No. 12 Décembre 1999

International Plant Genetic Resources Institute ,  [Newsletter for Sub-Saharan Africa: No. 13 May 2000] ,  Newsletter for Sub-Saharan Africa: No. 13 May 2000

Food and Agriculture Organization of the United Nations ,  [Plant Genetic Resources Newsletter: No. 30, June 1973] ,  Plant Genetic Resources Newsletter: No. 30, June 1973

International Board for Plant Genetic Resources ,  Food and Agriculture Organization of the United Nations ,  [Plant Genetic Resources Newsletter: No. 38, June 1979] ,  Plant Genetic Resources Newsletter: No. 38, June 1979