<http://webisa.webdatacommons.org/405844933>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<bc.edu> .
<http://webisa.webdatacommons.org/405844933>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/422969507>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/405844933> .
<http://webisa.webdatacommons.org/405844933>	<http://www.w3.org/ns/prov#value>	"The attack was a precursor to advance on Warsaw." .