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  1. Library Resource
    Journal Articles & Books
    December, 1991
    Nigeria, Africa, Western Africa

    In agriculture, surveying is required to prepare topographical maps that indicate variations in the level of the land's surface. Topographical maps are necessary as a base for the preparation of research station maps which include layout of field, buildings, roads, and soil conservation measures.

  2. Library Resource
    Journal Articles & Books
    December, 1991
    Costa Rica, Central America, South America

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