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2. Lead in urban street dust;DAY, J.P.; HART, M.; ROBINSON, M.S.;Nature. London,1975
3. EPA's Position on the Health Implications of Airborne Lead;ENVIRONMENTAL PROTECTION AGENCY,1973
4. Blood-lead levels, behaviour and intelligence: A population study;LANSDOWNE, R.G.; SHEPHERD, J.; CLAYTON, B.E.; DELVES, H.T.; GRAHAM, P.J.; TURNER, J.S.;Lancet,1974
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