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1. A detailed evaluation of the pollution hazard to village water supply boreholes in Eastern Botswana: report GS 10/4: evaluation of underground water resources (1978)
   Lewis, W.J.; Botswana, Department of Geological Survey
2. Some observations on the dust fallout results obtained for the Air Pollution Control Project at Pikwe between 1972 and 1975
   Botswana, Department of Geological Survey; Botswana, Ministry of Mineral Resources and Water Affairs; Hutton, L.G.; Lewis, W.J.
3. A report on nitrate contamination of groundwaters in some populated areas of Botswana
   Botswana, Department of Geological Survey; Botswana, Ministry of Mineral Resources and Water Affairs; Hutton, L.G.; Lewis, W.J.; Skinner, A.C.