Time trends of PCDD and PCDF concentration from 1860 and 1993 in the herbaria of Rothamsted agricultural experiment station (England) (d.w.: dry weight) (from Kjeller et al., 1996).

Time trends of PCDD and PCDF concentration from 1860 and 1993 in the herbaria of Rothamsted agricultural experiment station (England) (d.w.: dry weight) (from Kjeller et al., 1996).

From: Dioxins in the environment: What are the health risks?

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