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Category:Bark - Wikimedia Commons http://commons.wikimedia.org/wiki/Category:Bark?uselang=fr ScienceDirect - Science of The Total Environment : The lead, copper and zinc content of tree rings and bark A measurement of local metallic pollution http://www.sciencedirect.com/science/article/pii/0048969776900243 Vineland Chemical Company | Implementation of the Recovery Act | US EPA http://www.epa.gov/superfund/eparecovery/vineland_chemical.html ScienceDirect - Science of The Total Environment : Accumulation of lead in tree trunk bark pockets as pollution time capsules http://www.sciencedirect.com/science/article/pii/004896979504955X ScienceDirect - Geochimica et Cosmochimica Acta : Radial distribution of lead and lead isotopes in stem wood of Norway spruce: A reliable archive of pollution trends in Central Europe http://www.sciencedirect.com/science/article/pii/S0016703710002449 ScienceDirect - The Science of The Total Environment : Pb and 206Pb/207Pb isotopic analysis of a tree bark pocket near Sheffield, UK recording historical change in airborne pollution during the 20th Century
http://www.sciencedirect.com/science/article/pii/S0048969701010373 14757
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