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<http://webisa.webdatacommons.org/423906214>	<http://www.w3.org/ns/prov#value>	"Mercury is a trace element with both natural (native metal, Hg, and cinnabar, HgS) and anthropogenic (man-made) sources." .
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<http://webisa.webdatacommons.org/prov/436071365>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/423906214> .