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The circle of soil erosion.

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  • المؤلفون: Phillips, J.
  • المصدر:
    Focus. Spring91, Vol. 41 Issue 1, p24. 1/4p.
  • معلومة اضافية
    • الموضوع:
      SOIL conservation
    • نبذة مختصرة :
      Studies soil erosion problems in North America. Belief of many environmentalists that soil conservation has come full circle since the 1930s and that the high erosion rates of the dust bowl era are coming back; Highlights of research on the issue conducted by physical geographer John Wilson of Montana State University.