About: http://webisa.webdatacommons.org/1942338

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	Guided by aerial photographs, they would use such simple tools as compasses, altimeters and binoculars to get a feel for the land.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com