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References                                                      43

                  van Lynden GWJ (2004) European and world soils: present situation and expected evolution. In:
              International conference. Soil and compost eco-biology, Leon, 15–17 Sept 2004

                  Warren A, Khogali M (1992) Assessment of desertification and drought in the Sudano-Sahelion
              region IW-/99/. United Nations Sudano-Sahelian Offi ce, Sudan
                    Wienhold BJ, Andrews SS, Karlen DL (2004) Soil quality: a review of the science and experiences
              in the USA. Environ Geochem Health 26:89–95
                    Wilson  AD, MacLoad ND (1991) Overgrazing: present or absent? J Range Manage
              44(5):475–482
                  WRI (1997) World resources 1996–1997. World Resources Institute, Washington, DC
                    Zhang WL, Tian ZX, Zhang N, Li XQ (1996a) Nitrate pollution of groundwater in northern China.
              Agr Ecosyst Environ 59:223–231

                 Zhang H, Henderson-Sellers A, McGuffie K (1996b) Impacts of tropical deforestation I: Process
              analysis of local climatic change. J Climate 9:1497–1517
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