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<http://webisa.webdatacommons.org/prov/498557574>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/144280751> .
<http://webisa.webdatacommons.org/144280751>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<pbs.org> .
<http://webisa.webdatacommons.org/144280751>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/144280751>	<http://www.w3.org/ns/prov#value>	"Over 900 articles, speeches, letters, and other texts organized by subject, date, and author." .