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  • erosion, and if a benefical effect could be obtained with gypsiferous amendments. The effectiveness of different sources of gypsiferous materials on infiltration and erosion was also studied.
  • The GDR was the world biggest lignite producing country, but attendant symptoms were uneconomic management and environmental destruction. The development in two eastern mining areas is characterised by a dramatic decrease of lignite benefication
  • ratio. Studies of these issues will be benefical to the reveal of sediment erosional, transportational and depositional laws of a drainage system and decision-making for controlling soil and water loss.