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...