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<http://webisa.webdatacommons.org/15972048>	<http://www.w3.org/ns/prov#value>	"Their analysis looked at lead and other trace elements and isotopes -- cousins in the same elemental family that differ in atomic weight due to natural radioactive decay." .
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<http://webisa.webdatacommons.org/prov/3884113>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/15972048> .