<http://webisa.webdatacommons.org/145891538>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/155205495>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/145891538> .
<http://webisa.webdatacommons.org/145891538>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<retrievertraining.net> .
<http://webisa.webdatacommons.org/145891538>	<http://www.w3.org/ns/prov#value>	"long been covered up by the U.S. Air Force and other federal agencies" .