These are listed below:Anderson W L and Havera S P (1985), "Blood lead, protoporphyrin and ingested shot for detecting lead poisoning in wildfowl", Wildlife Society Bulletin, 13, pp. 26-31.Dieter M P and Finley M T (1978), "Delta-aminolevulinic acid dehydratase enzyme activity in blood, brain and liver of lead-dosed ducks", Environmental Resources, 19, pp. 127-135.Hall S L and Fisher F M (1985), "Lead concentrations in tissues of marsh birds: relationships of feeding habitats and grit preference to spent shot ingestion", Bulletin of Environmental Contaminant Toxicology, 35, pp. 1-8.Madsen H H T, Kkjorn T, Jorgensen P J and Grandjean P (1988), "Blood lead levels in patients with lead shot retained in the appendix", Acta Radiol, 29, pp. 745-746.Osweller G D, van Geldeer G A and Buck W B (1978), "Epiderminology of lead poisoning in animals" in Toxicity of heavy metals in the environment (editor F W Dehme), Marcel Dekker, New York.In Scotland...