1. Arid environment geochemical exploration in Saudi Arabia. The problem of aeolian contamination;Barbier;Journal Geochemical Exploration,1987
2. Dispersion of Copper and Associated Trace Elements in a Kalahari Sand Environment, Northwest Zambia;Brown,1970
3. Physical weathering and dispersion;Butt,1992
4. Climate, geo-morphological environment and geochemical dispersion models;Butt,1992
5. The geology of Botswana;Carney;Geological Survey, Ministry of Minerals, Energy and Water Affairs, Botswana, Bulletin,1994