<http://webisa.webdatacommons.org/prov/411906228>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/6636985> .
<http://webisa.webdatacommons.org/6636985>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/6636985>	<http://www.w3.org/ns/prov#value>	"One high-profile [FCDA Operation Alert] exercise occurred in 1955 when 15,000 federal employees, including the president, were evacuated from Washington to an encampment in rural Virginia." .
<http://webisa.webdatacommons.org/6636985>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<washingtonpost.com> .