'Samples from a Swiss bog show the highest levels of this element in the past 14,000 years were from 1975 to 1982'
Lead
THE ENVIRONMENT: Samples from a Swiss bog show the highest levels of this element in the past 14,000 years were from 1975 to 1982
Samples from a Swiss bog show the highest levels of this element in the past 14,000 years were from 1975 to 1982
Samples from a Swiss bog show the highest levels of this element in the past 14,000 years were from 1975 to 1982
THE ENVIRONMENT
Lead
THE ENVIRONMENT