“The application of the proposed methodology to chameleon’s eggs from southern in Spain showed that DDTs levels were similar and PCBs levels were higher than those obtained in 1997, probably due to the increase of industries and inhabitants of the studied area.”..
https://www.osti.gov/etdeweb/servlets/purl/20827821
https://www.osti.gov/etdeweb/servlets/purl/20827821