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      by 
      Jebril, Jebril Ali Abdalla Mohamad, author.
      Format: 
      Excerpt: 
      A3 hybrids were sterile and did not produce seed when heads were covered prior to pollination. The
      by 
      Norman, A. G. (Arthur Geoffrey), 1905-1982.
      Format: 
      Excerpt: 
      I. Maintaining Varietal Purity, and Cultural and Management PracticesII. Insect Pollination of