<http://webisa.webdatacommons.org/422511894>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/422511894>	<http://www.w3.org/ns/prov#value>	"I did a search and found this study of magnetic material in cigarette ash I also saw references to ash containing quartz, silica and other minerals." .
<http://webisa.webdatacommons.org/prov/449648233>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/422511894> .
<http://webisa.webdatacommons.org/prov/445394506>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/422511894> .
<http://webisa.webdatacommons.org/422511894>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<macobserver.com> .