About: http://webisa.webdatacommons.org/14811685

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	In the eighties, however, methodological and other difficulties began to arise.
http://www.w3.org/ns/prov#wasQuotedFrom	un.org