About: http://webisa.webdatacommons.org/157462063

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	Stones, trees and mountains were the early examples of points of reference, a concept that has evolved through times with the advent of (and the need for) more sophisticated techniques, objects and instruments.
http://www.w3.org/ns/prov#wasQuotedFrom	northsurveying.com