<http://webisa.webdatacommons.org/228157584>	<http://www.w3.org/ns/prov#value>	"On the basis of altimeter readings, they know how high above ground they are and whether they can fly safely over mountains and other obstacles." .
<http://webisa.webdatacommons.org/prov/61539067>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/228157584> .
<http://webisa.webdatacommons.org/228157584>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<blomshabeb.com> .
<http://webisa.webdatacommons.org/228157584>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .