1. Al-Atia MJ (1972) Trace elements in Iraqi oils and their geological significance. In: Mineral exploitation and economic geology. University of Wales, Aberystwyth
2. Alloway BJ (ed) (1995) Heavy metals in soils, 2nd edn. Blackie Academic & Professional, London
3. British Geological Survey (1992) Regional geochemistry of the Lake District and adjacent areas. British Geological Survey, Keyworth
4. Brothwood S (2001) Vehicle related emissions of platinum group elements and other heavy metals in the urban environment, PhD thesis, University of Wales, Aberystwyth
5. Burns KN, Allcroft R (1964) Fluorosis in cattle: occurrence and effects in industrial areas of England and Wales 1954–57, industrial disease surveys, reports 2, part 1. Ministry of Agriculture Fisheries and Food, London