About: http://webisa.webdatacommons.org/19707639

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For global navigation satellite systems, such as GPS, the satellite system time (such as GPS time) can be used as an external reference.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com