<http://webisa.webdatacommons.org/2638606>	<http://www.w3.org/ns/prov#value>	"Sulfur dioxide: Coal, petroleum, and other fuels are often impure and contain" .
<http://webisa.webdatacommons.org/2638606>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/151911006>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2638606> .
<http://webisa.webdatacommons.org/2638606>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<explainthatstuff.com> .