<http://webisa.webdatacommons.org/prov/299750386>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/207521743> .
<http://webisa.webdatacommons.org/prov/30562512>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/207521743> .
<http://webisa.webdatacommons.org/207521743>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<plos.org> .
<http://webisa.webdatacommons.org/207521743>	<http://www.w3.org/ns/prov#value>	"Some elements are not used in comparing ashes, particularly Na and K that are susceptible to variable exchange in hydrated glasses." .
<http://webisa.webdatacommons.org/207521743>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .