<http://webisa.webdatacommons.org/prov/408246944>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/13531560> .
<http://webisa.webdatacommons.org/13531560>	<http://www.w3.org/ns/prov#value>	"There are some books on the subject, mostly professional." .
<http://webisa.webdatacommons.org/13531560>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<amazon.ca> .
<http://webisa.webdatacommons.org/13531560>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .