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. ...