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Showing items 1 through 9 of 390.
  1. Library Resource
    Conference Papers & Reports
    December, 1996
    Africa

    Historically, water management has not been easy in the sub-region. Three climate interlinked factors have had a direct influence on it. The first is the aridity that affects all countries of the sub-region. It is impressing to think that about ninety percent of the area of the Maghrebine countries receive less than 100 mm rainfall per year that is poorly distributed. The second is the huge evaporation from open water reservoirs. For example, annual losses due to canal evaporation reach 2 cubic km in Egypt. Another factor is drought.

  2. Library Resource
    Reports & Research
    January, 1996
    Africa

    This paper presents the An assessment of urban environmental problems and policies in selected ECA member states, of the Ninth Session of the Conference of African Planners, Statisticians, Population and Information Specialists held at Addis Ababa, Ethiopia.

  3. Library Resource
    Journal Articles & Books
    December, 1996
    Mexico, Canada, Guatemala, Northern Africa, Southern Asia

    This paper discusses the centers of origin and diversity for bread wheat; sketches historical patterns in the sources and use of wheat genetic resources in modern plant breeding; identifies and compares indicators of genetic diversity used by social and biological scientists; reviews the relationship of wheat genetic diversity to yield stability and vulnerability to disease; develops a profile of the structure of genetic variation in wheat in the developing world today; and investigates how scientific plant breeding has influenced the structure of genetic variation among the major bread whe

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