يعرض 1 - 3 نتائج من 3 نتيجة بحث عن '"Soil conservation Study and teaching."', وقت الاستعلام: 0.02s تنقيح النتائج
  1. 1

    Integration of soil conservation concepts in the school curriculum.

    منشور في 1978
    كتاب

    Integration of soil conservation concepts in the school curriculum.
  2. 2

    Conservation of soil and water for the elementary schools.

    منشور في 1957
    كتاب

    Conservation of soil and water for the elementary schools.
  3. 3

    Soil conservation teaching.

    كتاب

    Soil conservation teaching.

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