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E J Underwood F R
M1tchell and J C Burr1dge
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absorption acrodermatitis enteropathica agricultural analysis analytical animals areas associated biogeochemical biological biosphere cancer cardiovascular disease chemical elements choropleth maps composition contain copper correlated crops D. D. Hemphill deficiency diet dietary distribution drinking water effects element concentrations endemic England and Wales environmental geochemistry environmental health essential example F1gure factors geochemical atlases geochemical environment geochemical maps Geochemical survey goitre heavy metals Hlth human health increase Institute of Geological intake interactions investigations Kwashiorkor levels London metabolic mineral molybdenum mortality nutritional organic parent materials plants pollution problems Proc regional geochemical relation rocks sampling sediment selenium Shacklette smelter sources species stream sediment studies substances in environmental surface waters Surv Thornton Tidball tissue toxic trace elements trace metals Trace substances U.S. geol U.S. Geological Survey ug/g United United Kingdom University of Missouri uptake variation water hardness Webb