http://www.chem.unep.ch/  ;  United Nations Environmental Programs choose Information on Persistant Organic Pollutants (POPs) Chemicals  ;   Choose link to Information on POPs Chemicals  and scroll down to research Dieldren, Dioxoins and DDT

http://www.who.int/pcs/    World Health Organization International Program on Chemical Safety; Home Page  This web site provides Risk Assessment of Priority Chemicals.  Note: 1) Environmental Health Criteria  2) Data sheets on Pesticides  3)  Joint FAO/WHO Meeting on Pesticide Residue Most of this may be acquired by ordering through WHO; example given below. Chemistry   

http://www.ewg.org  Environmental Working Group The Chemical Industry Archives:  chemical Industry Archives provides reports and news articles. Or go to:  the home page which allows for a search of DDT     

http://www.pesticide.org/ResPHealth.html    Researching Pesticides on the Web: A web site that aids in the daunting task of finding out more information on pesticides.

http://www.duke.edu/~chb7/Index.html     Duke University;  Properties, Politics and Policy,  Global environmental policy and politics of DDt.

http://www.who.int/pcs/jmpr/what_is_jmpr.html        IPCS;  Food and Agriculture Organization of the United Nations & World Health Organization;  What is JMPR?  The joint FAO/WHO Meeting on Pesticide Residues (JMPR), which has been meeting regularly since 1963, consists of the FAO Panel of Experts on Pesticide Residues in Food and the Environment and the WHO Core Assessment Group.